media: renesas: vsp1: Implement pixel format enumeration

media: renesas: vsp1: Implement pixel format enumeration

The VSP1 driver is missing the ability to enumerate pixel formats on its
video nodes, which is supposed to be supported according to the V4L2
API. Implement the enumeration to fix this issue.

As the device is media controller-centric, also implement the ability to
filter pixel formats by media bus code, and report the missing
V4L2_CAP_IO_MC capability.

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/20250429232904.26413-2-laurent.pinchart+renesas@ideasonboard.com
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>