modifications for new webrtc modules

Adapt include files path in makefile and source to new
directory structure in webrtc library.

Also changed the default AGC parameters to less extreme settings.

Change-Id: Ia6a41c816dc44645f8f867937b722eede88c06ea
diff --git a/media/libeffects/preprocessing/Android.mk b/media/libeffects/preprocessing/Android.mk
index 77d40b6..7f7c7e1 100755
--- a/media/libeffects/preprocessing/Android.mk
+++ b/media/libeffects/preprocessing/Android.mk
@@ -13,7 +13,7 @@
 LOCAL_C_INCLUDES += \
     external/webrtc/src \
     external/webrtc/src/modules/interface \
-    external/webrtc/src/modules/audio_processing/main/interface \
+    external/webrtc/src/modules/audio_processing/interface \
     system/media/audio_effects/include
 
 LOCAL_C_INCLUDES += $(call include-path-for, speex)