media: uvcvideo: Refactor the status irq API

There are two different use-cases of uvc_status():

- adding/removing a user when the camera is open/closed
- stopping/starting when the camera is suspended/resumed

Make the API reflect these two use-cases and move all the refcounting
and locking logic to the uvc_status.c file.

No functional change is expected from this patch.

Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/20240926-guenter-mini-v7-1-690441953d4a@chromium.org


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