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

Change-Id: I59d2e15b297b6ca2d5eee1a6dee642bdb01a3839


[ROCm/clr commit: 8717a78bf7]

projects/clr/hipamd/tests/src/hiprtc/saxpy.cpp

@@ -20,7 +20,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 */
 /* HIT_START
- * BUILD: %t %s ../test_common.cpp LINK_OPTIONS hiprtc EXCLUDE_HIP_PLATFORM nvcc rocclr
+ * BUILD: %t %s ../test_common.cpp LINK_OPTIONS hiprtc EXCLUDE_HIP_PLATFORM nvidia EXCLUDE_HIP_RUNTIME rocclr
  * TEST: %t
  * HIT_END
  */