Redfish: Fix System IndicatorLED

xyz.openbmc_project.LED.Controller.identify does not exist in all systems.
Checking LED group enclosure_identify is generic and is expected to
indicate the Indicator LED state.
Remove LED physical identify related code to make it generic for all systems.

Tested:
$curl -k -H "X-Auth-Token: $token" -d "{\"data\": true}" -X PUT https://${bmc}/xyz/openbmc_project/led/groups/enclosure_identify/attr/Asserted
{
  "data": null,
  "message": "200 OK",
  "status": "ok"
}
$ curl -k -H "X-Auth-Token: $token" X GET https://${bmc}/redfish/v1/Systems/system
{
  "@odata.context": "/redfish/v1/$metadata#ComputerSystem.ComputerSystem",
  "@odata.id": "/redfish/v1/Systems/system",
  "@odata.type": "#ComputerSystem.v1_6_0.ComputerSystem",
  "Actions": {
    "#ComputerSystem.Reset": {
      "ResetType@Redfish.AllowableValues": [
        "On",
        "ForceOff",
        "ForceOn",
        "ForceRestart",
        "GracefulRestart",
        "GracefulShutdown",
        "PowerCycle",
        "Nmi"
      ],
      "target": "/redfish/v1/Systems/system/Actions/ComputerSystem.Reset"
    }
  },
  "AssetTag": "",
  "BiosVersion": "open-power-witherspoon-v2.3-rc2-390-g8db7a9e",
  "Boot": {
    "BootSourceOverrideEnabled": "Disabled",
    "BootSourceOverrideMode": "Legacy",
    "BootSourceOverrideTarget": "None",
    "BootSourceOverrideTarget@Redfish.AllowableValues": [
      "None",
      "Pxe",
      "Hdd",
      "Cd",
      "Diags",
      "BiosSetup",
      "Usb"
    ]
  },
  "Description": "Computer System",
  "Id": "1069A8T         ",
  "IndicatorLED": "On",
  "Links": {
    "Chassis": [
      {
        "@odata.id": "/redfish/v1/Chassis/chassis"
      }
    ],
    "ManagedBy": [
      {
        "@odata.id": "/redfish/v1/Managers/bmc"
      }
    ]
  },
  "LogServices": {
    "@odata.id": "/redfish/v1/Systems/system/LogServices"
  },
  "Manufacturer": "",
  "Memory": {
    "@odata.id": "/redfish/v1/Systems/system/Memory"
  },
  "MemorySummary": {
    "Status": {
      "State": "Enabled"
    },
    "TotalSystemMemoryGiB": 0
  },
  "Model": "8286-42B        ",
  "Name": "system",
  "PartNumber": "",
  "PowerState": "Off",
  "ProcessorSummary": {
    "Count": 2,
    "Status": {
      "State": "Enabled"
    }
  },
  "Processors": {
    "@odata.id": "/redfish/v1/Systems/system/Processors"
  },
  "SerialNumber": "1069A8T         ",
  "Status": {
    "Health": "OK",
    "HealthRollup": "OK",
    "State": "Disabled"
  },
  "SystemType": "Physical"
}

The result of redfish Validator tool:
Counter Optional': 2480, 'metadataNamespaces': 1602, 'passGet': 191, 'serviceNamespaces': 69, 'invalidPropertyValue': 10, 'warningPresent': 6, 'passAction': 6, 'optionalAction': 5, 'warnDeprecated': 2, 'unverifiedComplexAdditional': 1})
Validation has succeeded.

Change-Id: Ie4b7931404fd072df4c6f215656436f07d3e4cde
Signed-off-by: Carol Wang <wangkair@cn.ibm.com>
diff --git a/redfish-core/lib/systems.hpp b/redfish-core/lib/systems.hpp
index d15a510..c51f37d 100644
--- a/redfish-core/lib/systems.hpp
+++ b/redfish-core/lib/systems.hpp
@@ -612,60 +612,6 @@
         "GetManagedObjects");
 }
 
-template <typename CallbackFunc>
-void getLedIdentify(std::shared_ptr<AsyncResp> aResp, CallbackFunc &&callback)
-{
-    BMCWEB_LOG_DEBUG << "Get identify led properties";
-    crow::connections::systemBus->async_method_call(
-        [aResp,
-         callback{std::move(callback)}](const boost::system::error_code ec,
-                                        const PropertiesType &properties) {
-            if (ec)
-            {
-                BMCWEB_LOG_DEBUG << "DBUS response error " << ec;
-                messages::internalError(aResp->res);
-                return;
-            }
-            BMCWEB_LOG_DEBUG << "Got " << properties.size()
-                             << " led properties.";
-            std::string output;
-            for (const auto &property : properties)
-            {
-                if (property.first == "State")
-                {
-                    const std::string *s =
-                        std::get_if<std::string>(&property.second);
-                    if (nullptr != s)
-                    {
-                        BMCWEB_LOG_DEBUG << "Identify Led State: " << *s;
-                        const auto pos = s->rfind('.');
-                        if (pos != std::string::npos)
-                        {
-                            auto led = s->substr(pos + 1);
-                            for (const std::pair<const char *, const char *>
-                                     &p :
-                                 std::array<
-                                     std::pair<const char *, const char *>, 3>{
-                                     {{"On", "Lit"},
-                                      {"Blink", "Blinking"},
-                                      {"Off", "Off"}}})
-                            {
-                                if (led == p.first)
-                                {
-                                    output = p.second;
-                                }
-                            }
-                        }
-                    }
-                }
-            }
-            callback(output, aResp);
-        },
-        "xyz.openbmc_project.LED.Controller.identify",
-        "/xyz/openbmc_project/led/physical/identify",
-        "org.freedesktop.DBus.Properties", "GetAll",
-        "xyz.openbmc_project.Led.Physical");
-}
 /**
  * @brief Retrieves host state properties over dbus
  *
@@ -1712,19 +1658,10 @@
         });
         getLedGroupIdentify(
             asyncResp,
-            [](const bool &asserted, const std::shared_ptr<AsyncResp> aRsp) {
+            [](bool asserted, const std::shared_ptr<AsyncResp> aRsp) {
                 if (asserted)
                 {
-                    // If led group is asserted, then another call is needed to
-                    // get led status
-                    getLedIdentify(
-                        aRsp, [](const std::string &ledStatus,
-                                 const std::shared_ptr<AsyncResp> aRsp) {
-                            if (!ledStatus.empty())
-                            {
-                                aRsp->res.jsonValue["IndicatorLED"] = ledStatus;
-                            }
-                        });
+                    aRsp->res.jsonValue["IndicatorLED"] = "On";
                 }
                 else
                 {