- Make sure ACodec reverts its state when it's shutdown
- Defer "resume" to after handling the OutputPortSettingsChange
- If the OMX_EventPortSettingsChanged event comes in while we're flushing, defer it
and make sure the output port can be disabled by deleting all buffers not already
owned by the component.
Change-Id: I1f8cdffa71237b57d4275a48b834647a7b263e8b