audio: Subsystem Restart changes

- Handle new ADSP status parameter
   - media/libmedia: Add new ADSP status audio parameter
   - framework/av: Add handling of new key-pair value in
     Audio Flinger

 - Handle Tunnel mode SubSys Restart
   - framework/av: Post SSR event to Audio Flinger
   - media/libmedia: Post SSR event to AudioTrack
   - media/libmediaplayerservice: Post SSR event to
     MediaPlayerService
   - media/libstagefright: Post SSR event to TunnelPlayer

Change-Id: I8c8385af45be91caf7d7160ab2e0236d6591b159