Revert "Changes to HIP to cope with Promote-free HCC"

This reverts commit efb9b9e86c.

Change-Id: I20a9bab3883ad09913b320210344d37599cb8fcd

src/hip_fp16.cpp

@@ -31,7 +31,7 @@ struct hipHalfHolder{
 
 #define HINF 65504
 
-__device__ static struct hipHalfHolder __hInfValue = {HINF};
+static struct hipHalfHolder __hInfValue = {HINF};
 
 __device__ __half __hadd(__half a, __half b) {
   return a + b;