Grid-launch updates to 2.0 and cleanup of old.

_ Use fields from GRID_LAUNCH_20 structure
  (See USE_GRID_LAUNCH_20 define, currently set to 0)
  "1" will require HCC support.
- Remove old DISABLE_GRID_LAUNCH support.

Change-Id: I584ce648d217251789a6283cf27feb24cb7dc8d1

hipamd/tests/src/kernel/hipGridLaunch.cpp

@@ -21,7 +21,6 @@ THE SOFTWARE.
 */
 // Test the Grid_Launch syntax.
 
-#undef DISABLE_GRID_LAUNCH /* Tell hip_*.h to compile in GL mode */
 #include "hip_runtime.h"
 #include "test_common.h"