stagefright: add an extra buffer to ANW's BUfferQueue

Add an extra buffer to ensure video player has a free buffer to
dequeue rather than wait for the queued buffer to be displayed.
Enable logs to indicate number of buffers allocated.

NOTE: This is not needed for 30fps content on 60fps panel, But
making this change regardless for all framerates till root-cause
is identified in SF

Change-Id: Id1048d7a104b2a75613dda8b9cf166e59bc4bb04

stagefright: ACodec: add an extra buffer to ANW's BUfferQueue

Add an extra min-undequeued buffer to ensure framework (ACodec)
has a free buffer to dequeue rather than wait for the queued buffer
to be displayed
This improves the performance of playback via nuPlayer.

Change-Id: If02a91f8121b7a2664c0264498c7b7e3031a88d7
CRs-Fixed: 607794

stagefright: Increase buffers with nativewindow

To avoid frame-drops due to latencies in rendering.

If (minUnDequeued) buffers are caught in display pipeline,
dequeueBuffer will block, which delays subsequent queuebuffer,
and this repeats until a buffer is canceled (frame drop).
This issue is more prominent with high resolution content
on secondary displays.

Adding additional buffers increases the stagger in display
and makes finding a free buffer more likely

Change-Id: I352a77ffcd67c8fdd1c2485e3737ba923950f8fd
CRs-Fixed: 714475