Added support for hipCtxSynchronize and hipCtxGetFlags,modified hipDeviceSynchronize

Change-Id: If7bac667a262fa8c0cb3dc93e97f2534855acd07

src/hip_device.cpp

@@ -160,11 +160,7 @@ hipError_t hipSetDevice(int deviceId)
  */
 hipError_t hipDeviceSynchronize(void)
 {
-    HIP_INIT_API();
-
-    ihipGetTlsDefaultCtx()->locked_waitAllStreams(); // ignores non-blocking streams, this waits for all activity to finish.
-
-    return ihipLogStatus(hipSuccess);
+    return ihipSynchronize();
 }