Add interface for focus gain in A2DP SNK audio track. am: ce917e4
am: 0b25324

* commit '0b25324daab8e118db22cd732e873d9bf4cf737a':
  Add interface for focus gain in A2DP SNK audio track.

Change-Id: I6b93b76b57c3a8d3462a86e0afad85fdc8ba634c