Camera3: fix ZSL processor3 issues

- Return input buffer in capture result. Per hal3.2 spec, we should return the
input buffer in process capture result rather than immediately after process
capture request.
- Make the depths of mZslQueue and mFrameList the same. It doesn't make sense
mFrameList depth is larger than mZslQueue depth.
- Set the depths of mZslQueue and mFrameList based on pipelineMaxDepth.
- Clear result queue while clearing zsl buffer queue.
- Hook up camera3 buffer listener with ZslProcessor3, make sure that adding the
same listener multiple times has no effect.
- Remove flush call in pushToReprocess, it is a guaranteed deadlock once
camera3 buffer listener is hooked up.

Change-Id: I285155ab4241e827145855d628f8e98b881c01d5