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/Android.mk b/services/audioflinger/Android.mk
index f8446ac..c359be5 100644
--- a/services/audioflinger/Android.mk
+++ b/services/audioflinger/Android.mk
@@ -50,6 +50,7 @@
 
 LOCAL_C_INCLUDES := \
     $(TOPDIR)frameworks/av/services/audiopolicy \
+    $(TOPDIR)external/sonic \
     $(call include-path-for, audio-effects) \
     $(call include-path-for, audio-utils)
 
@@ -68,7 +69,8 @@
     libhardware_legacy \
     libeffects \
     libpowermanager \
-    libserviceutility
+    libserviceutility \
+    libsonic
 
 LOCAL_STATIC_LIBRARIES := \
     libscheduling_policy \