android: camera_device: Remove shadowing FrameBuffer usage

A FrameBuffer *buffer is used to obtain the 'first' buffer from a
request which is used purely to identify the timestamp from the
metadata in two locations.

Rather than keep the FrameBuffer instance around, which then causes
further usages of FrameBuffers to be shadowed, store the timestamp
locally.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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