media: uvcvideo: Handle locks in uvc_queue_return_buffers

Most of the calls to uvc_queue_return_buffers() wrap the call with
spin_lock_irq()/spin_unlock_irq().

Rename uvc_queue_return_buffers to __uvc_queue_return_buffers to
indicate that this is the version that does not handle locks and create
a new version of the function that handles the lock.

Reviewed-by: Hans de Goede <hansg@kernel.org>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Link: https://lore.kernel.org/r/20250616-uvc-fop-v4-2-250286570ee7@chromium.org


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