Renable frexp(f) device math function

Change-Id: I53c022b8ddf38cd17ddb42eba457b9020db66395

include/hip/hcc_detail/math_functions.h

@@ -60,7 +60,7 @@ __device__ float fmaf(float x, float y, float z);
 __device__ float fmaxf(float x, float y);
 __device__ float fminf(float x, float y);
 __device__ float fmodf(float x, float y);
-//__device__ float frexpf(float x, int* nptr);
+__device__ float frexpf(float x, int* nptr);
 __device__ float hypotf(float x, float y);
 __device__ float ilogbf(float x);
 __device__ int isfinite(float a);
@@ -146,7 +146,7 @@ __device__ double fma(double x, double y, double z);
 __device__ double fmax(double x, double y);
 __device__ double fmin(double x, double y);
 __device__ double fmod(double x, double y);
-//__device__ double frexp(double x, int *nptr);
+__device__ double frexp(double x, int *nptr);
 __device__ double hypot(double x, double y);
 __device__ double ilogb(double x);
 __device__ int isfinite(double x);