sbgemm: avoid falling into SGEMM_KERNEL_DIRECT

Author: guowangy

interface/gemm.c

@@ -326,7 +326,7 @@ void CNAME(enum CBLAS_ORDER order, enum CBLAS_TRANSPOSE TransA, enum CBLAS_TRANS
 
   PRINT_DEBUG_CNAME;
 
-#if !defined(COMPLEX) && !defined(DOUBLE) && defined(USE_SGEMM_KERNEL_DIRECT)
+#if !defined(COMPLEX) && !defined(DOUBLE) && !defined(BFLOAT16) && defined(USE_SGEMM_KERNEL_DIRECT)
 #ifdef DYNAMIC_ARCH
  if (support_avx512() )
 #endif