sdbusplus: use shorter type aliases

The sdbusplus headers provide shortened aliases for many types.
Switch to using them to provide better code clarity and shorter
lines.  Possible replacements are for:
  * bus_t
  * exception_t
  * manager_t
  * match_t
  * message_t
  * object_t
  * slot_t

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I96286490697ce5d7fecc1c9c358f5f1d054137ec
diff --git a/usb/usb_manager.cpp b/usb/usb_manager.cpp
index 2bab2de..196ab42 100644
--- a/usb/usb_manager.cpp
+++ b/usb/usb_manager.cpp
@@ -90,7 +90,7 @@
     return;
 }
 
-void USBManager::updateActivation(sdbusplus::message::message& msg)
+void USBManager::updateActivation(sdbusplus::message_t& msg)
 {
     std::map<std::string, std::map<std::string, std::variant<std::string>>>
         interfaces;
diff --git a/usb/usb_manager.hpp b/usb/usb_manager.hpp
index 78e54aa..afb3cec 100644
--- a/usb/usb_manager.hpp
+++ b/usb/usb_manager.hpp
@@ -24,7 +24,7 @@
     USBManager& operator=(const USBManager&) = delete;
     USBManager& operator=(USBManager&&) = default;
 
-    explicit USBManager(sdbusplus::bus::bus& bus, sdeventplus::Event& event,
+    explicit USBManager(sdbusplus::bus_t& bus, sdeventplus::Event& event,
                         const fs::path& devPath, const fs::path& usbPath) :
         bus(bus),
         event(event), devicePath(devPath), usbPath(usbPath),
@@ -56,7 +56,7 @@
      *
      * @param[in]  msg   - Data associated with subscribed signal
      */
-    void updateActivation(sdbusplus::message::message& msg);
+    void updateActivation(sdbusplus::message_t& msg);
 
     /** @brief Set Apply Time to OnReset.
      *
@@ -71,7 +71,7 @@
 
   private:
     /** @brief Persistent sdbusplus DBus bus connection. */
-    sdbusplus::bus::bus& bus;
+    sdbusplus::bus_t& bus;
 
     /** sd event handler. */
     sdeventplus::Event& event;