TimestretchBufferProvider integration with Sonic Library

Using Sonic as backbone for time stretching algorithm.
Adding libsonic to needed makefiles.

bug: 19196501
Change-Id: I1ea9221d2f56e4e79fba8746ce0ad350b5079e82
diff --git a/services/audioflinger/tests/Android.mk b/services/audioflinger/tests/Android.mk
index 76997be..536eb93 100644
--- a/services/audioflinger/tests/Android.mk
+++ b/services/audioflinger/tests/Android.mk
@@ -44,7 +44,8 @@
 LOCAL_C_INCLUDES := \
 	$(call include-path-for, audio-effects) \
 	$(call include-path-for, audio-utils) \
-	frameworks/av/services/audioflinger
+	frameworks/av/services/audioflinger \
+	external/sonic
 
 LOCAL_STATIC_LIBRARIES := \
 	libsndfile
@@ -58,7 +59,8 @@
 	libdl \
 	libcutils \
 	libutils \
-	liblog
+	liblog \
+	libsonic
 
 LOCAL_MODULE:= test-mixer