Rename hip/hip_hcc.h to hip/hip_ext.h (#1341)

* Rename hip/hip_hcc.h to hip/hip_ext.h

* Deprecate hip_hcc.h


[ROCm/clr commit: dfee3ae279]

projects/clr/hipamd/samples/2_Cookbook/11_texture_driver/texture2dDrv.cpp

@@ -21,11 +21,9 @@ THE SOFTWARE.
 */
 
 #include "hip/hip_runtime.h"
-//#include "hip/hip_runtime_api.h"
 #include <iostream>
 #include <fstream>
 #include <vector>
-//#include <hip/hip_hcc.h>
 
 #define fileName "tex2dKernel.code"