Move audio_effects_conf.h to system/audio_effects

This file is not really related to HAL.

Change-Id: Ie584266c708cebac651997c8086032b4cc25832b
Test: make
diff --git a/services/audiopolicy/service/AudioPolicyEffects.cpp b/services/audiopolicy/service/AudioPolicyEffects.cpp
index 3556a70..6586bea 100644
--- a/services/audiopolicy/service/AudioPolicyEffects.cpp
+++ b/services/audiopolicy/service/AudioPolicyEffects.cpp
@@ -23,7 +23,7 @@
 #include <cutils/misc.h>
 #include <media/AudioEffect.h>
 #include <system/audio.h>
-#include <audio_effects/audio_effects_conf.h>
+#include <system/audio_effects/audio_effects_conf.h>
 #include <utils/Vector.h>
 #include <utils/SortedVector.h>
 #include <cutils/config_utils.h>