Bluetooth: A2dpSink change to handle Media Player Pause CMD

Camera Pauses the Playback before starting the Video recording
but it doesn't start the playback once recording is completed.
This change will Disconnect the A2dp and moves the A2dpSink
to proper state before starting the Video Recording.

Change-Id: I816edde2f5e3f7513dbe04961868a62b2e4f68a5
CRs-fixed: 591351