stagefright: BufferProducer updates

Update BufferQueue and ConsumerBase users to new BufferQueue
API, to allow BufferQueue slots to be reused.  Buffer consumers
generally now need to track the unique frameNumber belonging to
each frame acquired if they are using BufferQueue directly.
Otherwise, they can simply track the graphicBuffer.

Change-Id: I30ee3158cf40fb10bbd085241646d5f1128ee480
Signed-off-by: Lajos Molnar <lajos@google.com>
Related-to-bug: 7093648