add tests module tag to omx_tests

Change-Id: I5dcb5187f09a7ae980ac5857b7ade81001d459f8
diff --git a/media/libstagefright/omx/tests/Android.mk b/media/libstagefright/omx/tests/Android.mk
index bf69428..41c08be 100644
--- a/media/libstagefright/omx/tests/Android.mk
+++ b/media/libstagefright/omx/tests/Android.mk
@@ -7,11 +7,13 @@
 LOCAL_SHARED_LIBRARIES := \
 	libstagefright libbinder libmedia libutils
 
-LOCAL_C_INCLUDES:= \
+LOCAL_C_INCLUDES := \
 	$(JNI_H_INCLUDE) \
 	frameworks/base/media/libstagefright \
 	$(TOP)/frameworks/base/include/media/stagefright/openmax
 
-LOCAL_MODULE:= omx_tests
+LOCAL_MODULE := omx_tests
+
+LOCAL_MODULE_TAGS := tests
 
 include $(BUILD_EXECUTABLE)