Add the PiSP Frontend and Backend SharedMemObject file descriptors to the ipa::init() call. This will allow the pipeline handler to pass these objects to the IPA after construction. Add a flag to indicate if buffer swaps are needed when starting the ISP for the stitch block. Signed-off-by: Naushir Patuck <naush@raspberrypi.com> Reviewed-by: David Plowman <david.plowman@raspberrypi.com> Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>