Remove dependency on audio_* location

Change-Id: I4bc66115fcb9ba22b057bd72db3f561dcb18a0d8
diff --git a/media/libeffects/preprocessing/Android.mk b/media/libeffects/preprocessing/Android.mk
index 7f7c7e1..c13b9d4 100755
--- a/media/libeffects/preprocessing/Android.mk
+++ b/media/libeffects/preprocessing/Android.mk
@@ -14,7 +14,7 @@
     external/webrtc/src \
     external/webrtc/src/modules/interface \
     external/webrtc/src/modules/audio_processing/interface \
-    system/media/audio_effects/include
+    $(call include-path-for, audio-effects)
 
 LOCAL_C_INCLUDES += $(call include-path-for, speex)