SWDEV-486602 - Add tracking of HSA handlers

Add an atomic counter to track the outstanding HSA handlers.
Wait on CPU for the callbacks if the number exceeds the value
in DEBUG_HIP_BLOCK_SYNC env variable.

Change-Id: I95dc8c4bf0258c7e59411b7504220709ed6898c5

hipamd/src/hip_stream.cpp

@@ -359,14 +359,9 @@ hipError_t hipStreamSynchronize_common(hipStream_t stream) {
   }
   bool wait = (stream == nullptr || stream == hipStreamLegacy) ? true : false;
   auto hip_stream = hip::getStream(stream, wait);
-  bool wait_for_cpu = false;
-  // Force blocking wait if requested. That allows to avoid a build up of unreleased CPU commands
-  if (DEBUG_HIP_BLOCK_SYNC != 0) {
-    static std::atomic<uint64_t> flush = 0;
-    wait_for_cpu = ((++flush % DEBUG_HIP_BLOCK_SYNC) == 0) ? true : false;
-  }
+
   // Wait for the current host queue
-  hip_stream->finish(wait_for_cpu);
+  hip_stream->finish();
   // Release freed memory for all memory pools on the device
   hip_stream->GetDevice()->ReleaseFreedMemory();
   return hipSuccess;