Added webrtc audio processing library

Change-Id: I50d013b4d0de4a3abf3258f713617761bbd01199
diff --git a/target/product/core.mk b/target/product/core.mk
index caa3e38..5ffb9f6 100644
--- a/target/product/core.mk
+++ b/target/product/core.mk
@@ -97,7 +97,8 @@
     ip \
     screencap \
     sensorservice \
-    libspeexresampler
+    libspeexresampler \
+    libwebrtc_audio_preprocessing
 
 # host-only dependencies
 ifeq ($(WITH_HOST_DALVIK),true)