SWDEV-290160 - Switch to global HSA signals

Runtime can't assign internal HSA signals for HIP events, because
HIP application can destroy the HIP stream or signal reuse may
occur internally. Switch to global HSA signals for HIP events.

Change-Id: Ieaea2d6b039e492b2e7c5112782a8f4e601e50a1

rocclr/platform/command.hpp

@@ -95,6 +95,7 @@ class Event : public RuntimeObject {
   std::atomic_flag notified_;              //!< Command queue was notified
   void*  hw_event_;                        //!< HW event ID associated with SW event
   Event* notify_event_;                    //!< Notify event, which should contain HW signal
+  const Device* device_;                   //!< Device, this event associated with
 
  protected:
   static const EventWaitList nullWaitList;