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_stream.cpp

@@ -42,7 +42,9 @@ hipError_t hipStreamCreateWithFlags(hipStream_t *stream, unsigned int flags)
     //This matches CUDA stream behavior:
 
     auto istream = new ihipStream_t(device->_device_index, acc.create_view(), device->_stream_id, flags);
-    device->_streams.push_back(istream);
+
+    device->locked_addStream(istream);
+
     *stream = istream;
     tprintf(DB_SYNC, "hipStreamCreate, stream=%p\n", *stream);
 
@@ -82,7 +84,7 @@ hipError_t hipStreamSynchronize(hipStream_t stream)
 
     if (stream == NULL) {
         ihipDevice_t *device = ihipGetTlsDefaultDevice();
-        device->syncDefaultStream(true/*waitOnSelf*/);
+        device->locked_syncDefaultStream(true/*waitOnSelf*/);
     } else {
         stream->wait();
         e = hipSuccess;
@@ -106,7 +108,7 @@ hipError_t hipStreamDestroy(hipStream_t stream)
     //--- Drain the stream:
     if (stream == NULL) {
         ihipDevice_t *device = ihipGetTlsDefaultDevice();
-        device->syncDefaultStream(true/*waitOnSelf*/);
+        device->locked_syncDefaultStream(true/*waitOnSelf*/);
     } else {
         stream->wait();
         e = hipSuccess;
@@ -115,7 +117,7 @@ hipError_t hipStreamDestroy(hipStream_t stream)
     ihipDevice_t *device = stream->getDevice();
 
     if (device) {
-        device->_streams.remove(stream);
+        device->locked_removeStream(stream);
         delete stream;
     } else {
         e = hipErrorInvalidResourceHandle;