disabled half native support as inline asm is not working

Change-Id: I3073d8ae39eed321987f0f2f0e689eec4cdbb48c

hipamd/src/hip_fp16.cpp

@@ -22,8 +22,6 @@ THE SOFTWARE.
 
 #include"hip/hip_fp16.h"
 
-#if __CLANG_VERSION__ == 35
-
 static const unsigned sign_val = 0x8000;
 static const __half __half_value_one_float = {0x3C00};
 static const __half __half_value_zero_float = {0x0};
@@ -374,4 +372,3 @@ __device__ __half2 __lowhigh2highlow(const __half2 a){
 __device__ __half2 __low2half2(const __half2 a, const __half2 b){
   return {a.q, b.q};
 }
-#endif