frameworks/base: bluetooth: AVRCP 1.3 feature changes

Bluetooth module will listen metadata/event change intents
from Music app and post data to Bluez stack.

Modified by Chris Boyle: removed PLAYSTATUS_REQUEST/RESPONSE.
See http://review.cyanogenmod.com/14001

Conflicts:

	core/java/android/server/BluetoothA2dpService.java
	core/jni/android_server_BluetoothEventLoop.cpp

Gingerbread change Icbfb1712dde98c9677f57c869bcfffed2bb42a14

Change-Id: Id8cbec68302b53befbec4273013668a58c755369