Add BayerFormat::toPixelFormat() and BayerFormat::fromPixelFormat() helper functions to convert between BayerFormat and PixelFormat types. Signed-off-by: Naushir Patuck <naush@raspberrypi.com> Reviewed-by: David Plowman <david.plowman@raspberrypi.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> [Kieran: Minor checkstyle fix] Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>