added erfinv software implementation

Change-Id: Ib1a5584f6c81ab3afa70f7bcbfd7780e156454e3

include/hcc_detail/hip_runtime.h

@@ -220,6 +220,7 @@ __device__ double erf(double x);
 __device__ double erfc(double x);
 __device__ double erfcinv(double y);
 __device__ double erfcx(double x);
+__device__ double erfinv(double x);
 __device__ double exp(double x);
 __device__ double exp10(double x);
 __device__ double exp2(double x);