improving naming from __v_pk_fma_f16 to llvm_fma_v2f16
improving naming from __v_pk_fma_f16 to llvm_fma_v2f16

kknox/rocBLAS,guacamoleo/rocBLAS,tingxingdong/rocBLAS-1,guacamoleo/rocBLAS,kknox/rocBLAS,kknox/rocBLAS,guacamoleo/rocBLAS,tingxingdong/rocBLAS-1,guacamoleo/rocBLAS,tingxingdong/rocBLAS-1,kknox/rocBLAS,tingxingdong/rocBLAS-1