pal: Pause offload streams in a2dpSuspend

- Offload streams to be paused instead of Muting.
- Reduces the overall latency for a2dpSuspend if
  offload streams need to suspend/resume.
- Stream should let write to continue in Pause state
  Looks like an incorrect handling.

Change-Id: Icbec8c32d55bf4d0cdee3cc76e0d26db5e2aa49f
4 files changed