added read handler for TimeSource in AAI

Author: fessehaeve

src/app/clusters/time-synchronization-server/time-synchronization-server.cpp

@@ -1079,6 +1079,9 @@ CHIP_ERROR TimeSynchronizationAttrAccess::Read(const ConcreteReadAttributePath &
     case Granularity::Id: {
         return aEncoder.Encode(TimeSynchronizationServer::Instance().GetGranularity());
     }
+    case TimeSource::Id: {
+        return aEncoder.Encode(TimeSynchronizationServer::Instance().GetTimeSource());
+    }
     case TrustedTimeSource::Id: {
         return ReadTrustedTimeSource(aPath.mEndpointId, aEncoder);
     }

src/app/clusters/time-synchronization-server/time-synchronization-server.h

@@ -89,6 +89,7 @@ class TimeSynchronizationServer : public FabricTable::Delegate
     CHIP_ERROR SetUTCTime(chip::EndpointId ep, uint64_t utcTime, GranularityEnum granularity, TimeSourceEnum source);
     CHIP_ERROR GetLocalTime(chip::EndpointId ep, DataModel::Nullable<uint64_t> & localTime);
     GranularityEnum & GetGranularity() { return mGranularity; }
+    TimeSourceEnum & GetTimeSource() { return mTimeSource; }
 
     void ScheduleDelayedAction(System::Clock::Seconds32 delay, System::TimerCompleteCallback action, void * aAppState);