Make ihipDevice_t thread-safe.

Move critical data into separate class and protect with LockAccessor
wrapper class.

For device, the streams list is the critical data since it is modified when
streams are created or destroyed.   The streams list is accessed in
several places including when synchronizing across all streams on the
device (ie from the default stream).
Other device data is set once by the device cosntructor and is not critical
so

All functions which acquire the LockAccessor now named with "locked_" prefix.

src/hip_event.cpp

@@ -67,7 +67,7 @@ hipError_t hipEventRecord(hipEvent_t event, hipStream_t stream)
             // TODO-HCC fix this - is CUDA this conservative or still uses device timestamps?
             // TODO-HCC can we use barrier or event marker to implement better solution?
             ihipDevice_t *device = ihipGetTlsDefaultDevice();
-            device->syncDefaultStream(true);
+            device->locked_syncDefaultStream(true);
 
             eh->_timestamp = hc::get_system_ticks();
             eh->_state = hipEventStatusRecorded;
@@ -117,7 +117,7 @@ hipError_t hipEventSynchronize(hipEvent_t event)
             return ihipLogStatus(hipSuccess);
         } else if (eh->_stream == NULL) {
             ihipDevice_t *device = ihipGetTlsDefaultDevice();
-            device->syncDefaultStream(true);
+            device->locked_syncDefaultStream(true);
             return ihipLogStatus(hipSuccess);
         } else {
 #if __hcc_workweek__ >= 16033