Revert "Audio: fix stop issue for compress capture using MPEG4Writer"

- MPEG4Writer is waiting for FBD and camera stops giving buffers,
  then there is no buffer available to writer and thread is not
  joinable results in deadlock.
- Stop audio source before pthread_join to avoid deadlock during
  video recording

Change-Id: I871a969d844d98836b2e05d6d86606400926101f