libcamera: pipeline: rkisp1: Move start and stop of path to RkISP1Path

Move the start and stop of a path to RkISP1Path. This allows the
importing of buffers to be moved closer the path start/stop simplifying
the code. Also by adding a simple running tracker the error logic in
PipelineHandlerRkISP1 can be simplified as stop() can always be called.

This also removes all external users of RkISP1Path::video_ so it can be
made private.

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

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