Camera: Fix deadlock in Camera3OutputStream

process capture request thread, process capture result and setParameter
binder threads can run into circular locking situation when acquiring
StreamingProcessor lock, Camera3Stream lock, and bufferQueue lock.
Releasing the Camera3Stream lock briefly in process capture request
thread getbuffer call can break this deadlock.

Bug: 11016037
Change-Id: If08d4b134c26be26039b1d5363759e60f911bad6