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/hip commit: 579a4f36fa]

projects/hip/tests/src/runtimeApi/module/hipModuleGetGlobal.cpp

@@ -32,7 +32,7 @@ THE SOFTWARE.
 #include <iostream>
 #include <fstream>
 #include <vector>
-#include <hip/hip_hcc.h>
+#include <hip/hip_ext.h>
 
 #define LEN 64
 #define SIZE LEN * sizeof(float)