Fix mbtk Makefile

Change-Id: I7d7b848f05274890969b5f9ec8290eccbd22be68
diff --git a/mbtk/test/others/Makefile b/mbtk/test/others/Makefile
index bac02a3..e6071fb 100755
--- a/mbtk/test/others/Makefile
+++ b/mbtk/test/others/Makefile
@@ -7,7 +7,7 @@
 
 LIBS +=  -lmbtk_lib -laudio-apu -lcutils -ltinyalsa -lacm -lubus -lubox
 
-CFLAGS += 
+CFLAGS = $(CFLAGS_TEST)
 
 DEFINE +=