[droidcamsrc] have buffer pool for raw buffers #66
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Now that post-preview option is suppoted, raw preview buffer will be
used more often. Thus, it make sense to use buffer pool with raw
preview buffer too.
This patch add code to ensure & configure buffer pool for raw buffers
whenever preview callback is required to be enabled. While at it, also
add support for buffer pool negotiation when using raw preview mode.
This reduces CPU usage as it longer repeatedly allocate memory.