Instantiate SingleStateQueue<AudioTimestamp>

as typedef AudioTimestampSingleStateQueue and use it in MonoPipe.

Change-Id: Idaebb362bd9d0a81a7ed83792ab9369dc37c0e74
diff --git a/media/libmedia/Android.mk b/media/libmedia/Android.mk
index 96755bb..56e7787 100644
--- a/media/libmedia/Android.mk
+++ b/media/libmedia/Android.mk
@@ -62,6 +62,7 @@
 LOCAL_CFLAGS += -DANDROID_SMP=$(if $(findstring true,$(TARGET_CPU_SMP)),1,0)
 LOCAL_SRC_FILES += SingleStateQueue.cpp
 LOCAL_CFLAGS += -DSINGLE_STATE_QUEUE_INSTANTIATIONS='"SingleStateQueueInstantiations.cpp"'
+# Consider a separate a library for SingleStateQueueInstantiations.
 
 LOCAL_SHARED_LIBRARIES := \
 	libui liblog libcutils libutils libbinder libsonivox libicuuc libexpat \