Change AC Lost to PSU Power Lost

Change AC Lost to PSU Power Lost according to Redfish.

Tested:
Remove AC cable from one PSU, Redfish log will show
{
    "@odata.context": "/redfish/v1/$metadata#LogEntry.LogEntry",
    "@odata.id": "/redfish/v1/Systems/system/LogServices/EventLog/Entries/
1568510552",
    "@odata.type": "#LogEntry.v1_4_0.LogEntry",
    "Created": "2019-09-15T01:22:32+00:00",
    "EntryType": "Event",
    "Id": "1568510552",
    "Message": "Power supply PSU1 power lost.",
    "MessageArgs": [
        "PSU1"
    ],
    "MessageId": "OpenBMC.0.1.PowerSupplyPowerLost",
    "Name": "System Event Log Entry",
    "Severity": "Critical"
},
Plug in AC cable again, Redfish log will show
{
    "@odata.context": "/redfish/v1/$metadata#LogEntry.LogEntry",
    "@odata.id": "/redfish/v1/Systems/system/LogServices/EventLog/Entries/
1568510553",
    "@odata.type": "#LogEntry.v1_4_0.LogEntry",
    "Created": "2019-09-15T01:22:33+00:00",
    "EntryType": "Event",
    "Id": "1568510553",
    "Message": "Power supply PSU1 power restored.",
    "MessageArgs": [
        "PSU1"
    ],
    "MessageId": "OpenBMC.0.1.PowerSupplyPowerRestored",
    "Name": "System Event Log Entry",
    "Severity": "OK"
},

Signed-off-by: Cheng C Yang <cheng.c.yang@linux.intel.com>
Change-Id: I481b5c7683220ece278a4973570b33dc93106f8c
diff --git a/src/PSUEvent.cpp b/src/PSUEvent.cpp
index b7cd3ae..6d2a3e6 100644
--- a/src/PSUEvent.cpp
+++ b/src/PSUEvent.cpp
@@ -75,8 +75,8 @@
         {"Failure",
          {"OpenBMC.0.1.PowerSupplyFailed", "OpenBMC.0.1.PowerSupplyRecovered"}},
         {"ACLost",
-         {"OpenBMC.0.1.PowerSupplyACLost",
-          "OpenBMC.0.1.PowerSupplyACInserted"}},
+         {"OpenBMC.0.1.PowerSupplyPowerLost",
+          "OpenBMC.0.1.PowerSupplyPowerRestored"}},
         {"FanFault",
          {"OpenBMC.0.1.PowerSupplyFanFailed",
           "OpenBMC.0.1.PowerSupplyFanRecovered"}},