Update KERNEL.ZEN

Author: wjc404

kernel/x86_64/KERNEL.ZEN

@@ -31,7 +31,7 @@ CAXPYKERNEL = caxpy.c
 ZAXPYKERNEL = zaxpy.c
 
 STRMMKERNEL    =  sgemm_kernel_8x4_haswell.c
-SGEMMKERNEL    =  sgemm_kernel_8x4_haswell.c
+SGEMMKERNEL    =  sgemm_kernel_8x4_haswell_2.c
 SGEMMINCOPY    =  ../generic/gemm_ncopy_8.c
 SGEMMITCOPY    =  ../generic/gemm_tcopy_8.c
 SGEMMONCOPY    =  ../generic/gemm_ncopy_4.c