RDKEMW-4220: Fix wpeframework crash on reactivating plugin and powerstate change

Signed-off-by: leenaS-d <[email protected]>

Author: leenaS-d

HdmiCecSink/HdmiCecSink.cpp

@@ -824,6 +824,7 @@ namespace WPEFramework
        {
            if(_powerManagerPlugin)
            {
+               _powerManagerPlugin->Unregister(_pwrMgrNotification.baseInterface<Exchange::IPowerManager::IModeChangedNotification>());
                _powerManagerPlugin.Reset();
            }
            _registeredEventHandlers = false;

HdmiCecSource/HdmiCecSourceImplementation.cpp

@@ -385,6 +385,7 @@ namespace WPEFramework
 
            if(_powerManagerPlugin)
            {
+               _powerManagerPlugin->Unregister(_pwrMgrNotification.baseInterface<Exchange::IPowerManager::IModeChangedNotification>());
                _powerManagerPlugin.Reset();
            }
            _registeredEventHandlers = false;