A2dpSink: Handle releasing focus in Disconnecting state.

- When single device connected first time to sink and start
  streaming, audio focus has been granted. Then disconnect
  device from Sink, connect again and start stream. This time
  when audio focus requested, audiomanager has been rejected
  due to previousely granted focus has not released due to not
  handling of release focus in disconnecting state. This change
  would take care of proper release of audio focus whenever
  device got disconnected, so that from next connection onwards
  audiofocus has been granted properly.

- Initite Handoff when device is got connected, instaed doing
  on Audio config change.

- Remove toast message displaying

CRs-Fixed: 2406244
Change-Id: I68619999f9f0c04d98e66692e9f8fe41a5b7eb08
2 files changed