audio: mpq: Move audio output activities to audio_stream_out

Move output activities to audio_stream_out, output activites on
mpq may involve multiple handles for a single hal session, and
needs elaborate handling.

Change-Id: I42b7e16cf316be89cbe22bd70b6c685d89f15f27
diff --git a/hal_mpq/Android.mk b/hal_mpq/Android.mk
index 338ee40..24fca4e 100644
--- a/hal_mpq/Android.mk
+++ b/hal_mpq/Android.mk
@@ -10,6 +10,7 @@
 
 LOCAL_SRC_FILES := \
 	audio_hw.c \
+	audio_stream_out.c \
 	$(AUDIO_PLATFORM)/hw_info.c \
 	$(AUDIO_PLATFORM)/platform.c