audio routing management for radio

Added radio tuner device connection/disconnection
indication to audio policy manager.

Added documentation and removed unused Module
class member.

Change-Id: I92438c1ff212c4d76f008149554fa89e367fee42
diff --git a/services/radio/Android.mk b/services/radio/Android.mk
index 5e89b22..9ee5666 100644
--- a/services/radio/Android.mk
+++ b/services/radio/Android.mk
@@ -26,6 +26,7 @@
     libutils \
     libbinder \
     libcutils \
+    libmedia \
     libhardware \
     libradio \
     libradio_metadata