Exclude rs_matrixNxN from being RS object type.

rs_matrix{2x2, 3x3, 4x4} (RS matrix type) is very different than RS
object type like rs_allocation. This commit teaches llvm-rs-cc to learn
it.

NOTE: Currenrly RS matrix type + RS object type = RS specific type.
diff --git a/Android.mk b/Android.mk
index caec2e7..17c289b 100644
--- a/Android.mk
+++ b/Android.mk
@@ -174,6 +174,7 @@
 	RSDataTypeEnums.inc	\
 	RSDataElementEnums.inc	\
 	RSDataKindEnums.inc	\
+	RSMatrixTypeEnums.inc	\
 	RSObjectTypeEnums.inc
 
 LOCAL_SRC_FILES :=	\