opnsrc-csys-intf-wfd: Install modules to sys-ext partition

Change-Id: I6788e1f2ec5a4f2bba012e8093594eac7c7b0c71
diff --git a/libaac/Android.mk b/libaac/Android.mk
index 38551d0..367d9c0 100644
--- a/libaac/Android.mk
+++ b/libaac/Android.mk
@@ -15,7 +15,7 @@
 LOCAL_32_BIT_ONLY := true
 LOCAL_MODULE := libwfdaac
 LOCAL_CFLAGS += -O0
-
+LOCAL_SYSTEM_EXT_MODULE := true
 LOCAL_SANITIZE := integer_overflow
 include $(BUILD_SHARED_LIBRARY)