NuPlayer: Fix for audio mute after call termination

- Audio is muted while resuming music after call termination
- Offload track is tear down by audio flinger/policy manager
  during call & TEAR_DOWN event is propgated to audio track.
  Audio track returned error on resume of playback since track
  is already closed
- Add error handling in nuplayer during resume & force recreation
  of audio track from NuPlayerRenderer if resume fails

CRs-fixed: 759500
Change-Id: Ic84e692511b085e75a96ae711e5b1585fce47758