Fix warpSize, for related issue in hipeigen and torch

Change-Id: Ic66b24923a363304dca189011869ba7a0a6f8895

src/device_util.cpp

@@ -835,10 +835,6 @@ __device__ float __hip_ynf(int n, float x)
     return b0;
 }
 
-
-
-const int warpSize = 64;
-
 __device__ long long int clock64() { return (long long int)hc::__cycle_u64(); };
 __device__ clock_t clock() { return (clock_t)hc::__cycle_u64(); };