Add GFX908 specific changes to HIP (#1229)

* Add GFX908 specific for HIP

* Fix missing __halfTest in hipTestNativeHalf

tests/src/deviceLib/hipMathFunctions.cpp

@@ -29,7 +29,7 @@ THE SOFTWARE.
 #include "hip/hip_runtime.h"
 #include "test_common.h"
 
-#if __HIP_ARCH_GFX803__ || __HIP_ARCH_GFX900__ || __HIP_ARCH_GFX906__
+#if __HIP_ARCH_GFX803__ || __HIP_ARCH_GFX900__ || __HIP_ARCH_GFX906__ || __HIP_ARCH_GFX908__
 
 __global__ void kernel_abs_int64(long long *input, long long *output) {
     int tx = threadIdx.x;