Remove dependency on audio_* location

Change-Id: I4bc66115fcb9ba22b057bd72db3f561dcb18a0d8
diff --git a/media/libeffects/factory/Android.mk b/media/libeffects/factory/Android.mk
index 2f2b974..6e69151 100644
--- a/media/libeffects/factory/Android.mk
+++ b/media/libeffects/factory/Android.mk
@@ -15,6 +15,6 @@
 LOCAL_SHARED_LIBRARIES += libdl
 
 LOCAL_C_INCLUDES := \
-    system/media/audio_effects/include
+    $(call include-path-for, audio-effects)
 
 include $(BUILD_SHARED_LIBRARY)