Rename BGEMM to BNNM. Modify layout of eight-bit GEMM-like intrinsic storage.

Change-Id: If4b1267dfd42d6dd65bedf20c0b674479eefab35
diff --git a/rsDefines.h b/rsDefines.h
index 8b334c6..9287470 100644
--- a/rsDefines.h
+++ b/rsDefines.h
@@ -421,7 +421,7 @@
     RsBlas_zher2k = 142,
 
     // BLAS extensions start here
-    RsBlas_bgemm = 1000,
+    RsBlas_bnnm = 1000,
 };
 
 // custom complex types because of NDK support