media: rcar-vin: Generate FRAME_SYNC events

Enable the VSYNC Rising Edge Detection interrupt and generate a
FRAME_SYNC event form it. The interrupt is available on all supported
models of the VIN (Gen2, Gen3 and Gen4).

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Link: https://lore.kernel.org/r/20250616185722.980722-4-niklas.soderlund+renesas@ragnatech.se


Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>