[dtests] Disable hip_threadfence_system.tst on nvcc

The test needs some more modifications before it is ready for building
on nvcc path. Disabling it for now so that the pull request can be
merged.

Change-Id: I19a894fcda7b2159f86a4e4e95a409c5655d3760


[ROCm/clr commit: 0d537f9966]

projects/clr/hipamd/tests/src/deviceLib/hip_threadfence_system.cpp

@@ -21,7 +21,7 @@ THE SOFTWARE.
 */
 
 /* HIT_START
- * BUILD: %t %s ../test_common.cpp
+ * BUILD: %t %s ../test_common.cpp EXCLUDE_HIP_PLATFORM nvcc
  * RUN: %t
  * HIT_END
  */