entity-manager: not pass through io, objServer

Pass
`boost::asio::io_context& io`
and
`sdbusplus::asio::object_server& objServer`

into constructor for class EMDBusInterface.

Since these are just references, nothing exciting should happen here.
The change reduces the number of parameters and makes the code more
easily readable.

Tested: on Tyan S8030

clean log
```
Sep 22 16:00:47 s8030-bmc-30303035c0c1 systemd[1]: Started Entity Manager.
Sep 22 16:00:57 s8030-bmc-30303035c0c1 entity-manager[10392]: Inventory Added: Supermicro PWS 920P SQ 0
Sep 22 16:00:57 s8030-bmc-30303035c0c1 entity-manager[10392]: Inventory Added: Supermicro PWS 920P SQ 1
Sep 22 16:00:57 s8030-bmc-30303035c0c1 entity-manager[10392]: Inventory Added: Tyan S8030 Baseboard
Sep 22 16:00:57 s8030-bmc-30303035c0c1 entity-manager[10392]: Inventory Added: MBX 1.57 Chassis
```

and clean `busctl tree`
```
busctl tree xyz.openbmc_project.EntityManager
`- /xyz
  `- /xyz/openbmc_project
    |- /xyz/openbmc_project/EntityManager
    `- /xyz/openbmc_project/inventory
      `- /xyz/openbmc_project/inventory/system
        |- /xyz/openbmc_project/inventory/system/board
        | `- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/CPU0_Power_Consumption
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/CPU0_Temp
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/GARBO_SENSOR
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/HostSPIFlash
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/P0_VDD_18_RUN
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/P0_VDD_CORE_RUN
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/P0_VDD_MEM_ABCD
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/P0_VDD_MEM_EFGH
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/P0_VDD_SOC_RUN
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/VBAT_33
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/VDD_12_RUN
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/VDD_33_DUAL
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/VDD_33_RUN
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/VDD_5_DUAL
        |   |- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/VDD_5_RUN
        |   `- /xyz/openbmc_project/inventory/system/board/Tyan_S8030_Baseboard/X550
        |- /xyz/openbmc_project/inventory/system/chassis
        | `- /xyz/openbmc_project/inventory/system/chassis/MBX_1_57_Chassis
        |   |- /xyz/openbmc_project/inventory/system/chassis/MBX_1_57_Chassis/Fan_Control
        |   |- /xyz/openbmc_project/inventory/system/chassis/MBX_1_57_Chassis/GenericContainPort
        |   |- /xyz/openbmc_project/inventory/system/chassis/MBX_1_57_Chassis/NIC_1_Ignore
        |   |- /xyz/openbmc_project/inventory/system/chassis/MBX_1_57_Chassis/NIC_2_Ignore
        |   |- /xyz/openbmc_project/inventory/system/chassis/MBX_1_57_Chassis/NIC_FRU_1
        |   |- /xyz/openbmc_project/inventory/system/chassis/MBX_1_57_Chassis/NIC_FRU_2
        |   |- /xyz/openbmc_project/inventory/system/chassis/MBX_1_57_Chassis/SYS_FAN_1
        |   |- /xyz/openbmc_project/inventory/system/chassis/MBX_1_57_Chassis/SYS_FAN_2
        |   |- /xyz/openbmc_project/inventory/system/chassis/MBX_1_57_Chassis/SYS_FAN_3
        |   |- /xyz/openbmc_project/inventory/system/chassis/MBX_1_57_Chassis/Temperature_Control
        |   `- /xyz/openbmc_project/inventory/system/chassis/MBX_1_57_Chassis/Zone0
        `- /xyz/openbmc_project/inventory/system/powersupply
          |- /xyz/openbmc_project/inventory/system/powersupply/Supermicro_PWS_920P_SQ_0
          | |- /xyz/openbmc_project/inventory/system/powersupply/Supermicro_PWS_920P_SQ_0/PSU0
          | |- /xyz/openbmc_project/inventory/system/powersupply/Supermicro_PWS_920P_SQ_0/PSU0_ADDR
          | `- /xyz/openbmc_project/inventory/system/powersupply/Supermicro_PWS_920P_SQ_0/PSU0_FRU
          `- /xyz/openbmc_project/inventory/system/powersupply/Supermicro_PWS_920P_SQ_1
            |- /xyz/openbmc_project/inventory/system/powersupply/Supermicro_PWS_920P_SQ_1/PSU1
            |- /xyz/openbmc_project/inventory/system/powersupply/Supermicro_PWS_920P_SQ_1/PSU1_ADDR
            `- /xyz/openbmc_project/inventory/system/powersupply/Supermicro_PWS_920P_SQ_1/PSU1_FRU
```

Change-Id: Id292bf86a72c9b6e707b2cec71b77c63ed5077a2
Signed-off-by: Alexander Hansen <alexander.hansen@9elements.com>
diff --git a/src/entity_manager/dbus_interface.hpp b/src/entity_manager/dbus_interface.hpp
index 84efec8..30423e6 100644
--- a/src/entity_manager/dbus_interface.hpp
+++ b/src/entity_manager/dbus_interface.hpp
@@ -16,20 +16,37 @@
 class EMDBusInterface
 {
   public:
+    EMDBusInterface(boost::asio::io_context& io,
+                    sdbusplus::asio::object_server& objServer);
+
     std::shared_ptr<sdbusplus::asio::dbus_interface> createInterface(
-        sdbusplus::asio::object_server& objServer, const std::string& path,
-        const std::string& interface, const std::string& parent,
-        bool checkNull = false);
+        const std::string& path, const std::string& interface,
+        const std::string& parent, bool checkNull = false);
 
     std::vector<std::weak_ptr<sdbusplus::asio::dbus_interface>>&
         getDeviceInterfaces(const nlohmann::json& device);
 
-    void createAddObjectMethod(
-        boost::asio::io_context& io, const std::string& jsonPointerPath,
-        const std::string& path, nlohmann::json& systemConfiguration,
-        sdbusplus::asio::object_server& objServer, const std::string& board);
+    void createAddObjectMethod(const std::string& jsonPointerPath,
+                               const std::string& path,
+                               nlohmann::json& systemConfiguration,
+                               const std::string& board);
+
+    void populateInterfaceFromJson(
+        nlohmann::json& systemConfiguration, const std::string& jsonPointerPath,
+        std::shared_ptr<sdbusplus::asio::dbus_interface>& iface,
+        nlohmann::json& dict,
+        sdbusplus::asio::PropertyPermission permission =
+            sdbusplus::asio::PropertyPermission::readOnly);
+
+    void createDeleteObjectMethod(
+        const std::string& jsonPointerPath,
+        const std::shared_ptr<sdbusplus::asio::dbus_interface>& iface,
+        nlohmann::json& systemConfiguration);
 
   private:
+    boost::asio::io_context& io;
+    sdbusplus::asio::object_server& objServer;
+
     boost::container::flat_map<
         std::string,
         std::vector<std::weak_ptr<sdbusplus::asio::dbus_interface>>>
@@ -138,18 +155,4 @@
     }
 }
 
-void createDeleteObjectMethod(
-    const std::string& jsonPointerPath,
-    const std::shared_ptr<sdbusplus::asio::dbus_interface>& iface,
-    sdbusplus::asio::object_server& objServer,
-    nlohmann::json& systemConfiguration, boost::asio::io_context& io);
-
-void populateInterfaceFromJson(
-    boost::asio::io_context& io, nlohmann::json& systemConfiguration,
-    const std::string& jsonPointerPath,
-    std::shared_ptr<sdbusplus::asio::dbus_interface>& iface,
-    nlohmann::json& dict, sdbusplus::asio::object_server& objServer,
-    sdbusplus::asio::PropertyPermission permission =
-        sdbusplus::asio::PropertyPermission::readOnly);
-
 } // namespace dbus_interface