libcamera: pipeline: rkisp1: Prepare buffer ready handlers for multiple streams

The buffer ready handlers are designed for a single application facing
stream from the main path. To prepare for multiple application facing
streams from main and/or self path the handlers need to be prepared.

The data keeping track of the frame number and advancing the timeline
can be moved from the application facing buffer ready handler to the
statistics handler. For each request processed there will always be a
statistic buffer and as the ISP is inline and is the source of both
main, self and statistic paths there is no change in behavior.

The application facing handler no longer needs a special case for
cancelled frames and can be made simpler. With this change the handlers
are ready to deal with any combinations of application facing streams.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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