media: uvcvideo: Introduce dev->meta_formats

Right now, there driver supports devices with one or two metadata
formats. Prepare it to support more than two metadata formats.

This is achieved with the introduction of a new field `meta_formats`,
that contains the array of metadata formats supported by the device, in
the order expected by userspace.

Suggested-by: Hans de Goede <hansg@kernel.org>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Reviewed-by: Hans de Goede <hansg@kernel.org>
Link: https://lore.kernel.org/r/20250707-uvc-meta-v8-3-ed17f8b1218b@chromium.org


Signed-off-by: Hans de Goede <hansg@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>