SWDEV-318349 - Remove sync for null stream

Remove sync for null stream in  hipGraphExec::Run()

Change-Id: Ieaaed1c15b4d258193d8341d4b17d9f03a9e4783

hipamd/src/hip_graph_internal.cpp

@@ -817,7 +817,6 @@ hipError_t hipGraphExec::Run(hipStream_t stream) {
     endCommand->enqueue();
     endCommand->release();
   }
-  if (stream == nullptr)  queue->finish();
   ResetQueueIndex();
   return status;
 }