SWDEV-480209 - Handle GraphExec object release

=> GraphExec instance is destroyed before async launch completes,
destroy after all pending graph launches
=> Remove GraphExec destroy during next sync point(hipStreamSync,
hipDeviceSync etc..)

Change-Id: I4df682aae5787fd6e5240a7be936ce50361345d0

hipamd/src/hip_internal.hpp

@@ -89,8 +89,6 @@ struct GraphNode;
 struct GraphExec;
 struct UserObject;
 class Stream;
-extern void ReleaseGraphExec(int deviceId);
-extern void ReleaseGraphExec(hip::Stream* stream);
 typedef struct ihipIpcMemHandle_st {
   char ipc_handle[IHIP_IPC_MEM_HANDLE_SIZE];  ///< ipc memory handle on ROCr
   size_t psize;