media: renesas: vsp1: Name nested structure in vsp1_drm

media: renesas: vsp1: Name nested structure in vsp1_drm

The vsp1_drm structure defines an anonymous nested structure to store
per-input data. In preparation for extending that structure, give it a
name and is it through the driver. This improves code readability.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen+renesas@ideasonboard.com>
Link: https://lore.kernel.org/r/20250429232904.26413-8-laurent.pinchart+renesas@ideasonboard.com
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>