cmake hip-rocclr as default build,change HIP_PLATFORM to amd|nvidia

Change-Id: I59d2e15b297b6ca2d5eee1a6dee642bdb01a3839


[ROCm/clr commit: 8717a78bf7]

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

@@ -18,7 +18,7 @@ THE SOFTWARE.
 */
 /* HIT_START
  * BUILD: %t %s NVCC_OPTIONS -std=c++11
- * TEST: %t EXCLUDE_HIP_PLATFORM nvcc
+ * TEST: %t EXCLUDE_HIP_PLATFORM nvidia
  * HIT_END
  */
 #include "test_common.h"