SWDEV-271406 - Remove unecessary hip_ext.h

tests/src/runtimeApi/module/hipModuleLaunchKernel.cpp doesn't
need hip_ext.h which will fail cuda building. So remove it

Change-Id: Icf5763449ccec839d9efda90ffe3a86fb53bdb85


[ROCm/clr commit: a6176099cf]

projects/clr/hipamd/tests/src/runtimeApi/module/hipModuleLaunchKernel.cpp

@@ -28,7 +28,6 @@
 
 
 #include "test_common.h"
-#include "hip/hip_ext.h"
 
 #define fileName "matmul.code"
 #define matmulK "matmulK"