FastMixer update

Updates:
 - Add support for mono fast tracks
 - Add support for optional sample rate conversion on fast tracks
 - Log sample rate and frame count
 - Enable statistics

Change-Id: Ife014edf4f452da361f3eaaae19209ef6ff6958b
diff --git a/services/audioflinger/Android.mk b/services/audioflinger/Android.mk
index d52ed42..4667649 100644
--- a/services/audioflinger/Android.mk
+++ b/services/audioflinger/Android.mk
@@ -64,7 +64,7 @@
 
 LOCAL_SRC_FILES += FastMixer.cpp FastMixerState.cpp
 
-#LOCAL_CFLAGS += -DFAST_MIXER_STATISTICS
+LOCAL_CFLAGS += -DFAST_MIXER_STATISTICS
 
 LOCAL_CFLAGS += -DSTATE_QUEUE_INSTANTIATIONS='"StateQueueInstantiations.cpp"'