media: adv7180: Use v4l2-ctrls core to handle s_ctrl locking

media: adv7180: Use v4l2-ctrls core to handle s_ctrl locking

Instead of handling the state lock ourself in .s_ctrl use the v4l2-ctrls
core to handle it for us. This will allow us later to use the unlocked
__v4l2_ctrl_handler_setup() in initialization code where the state lock
is already held.

Add a lockdep assert to demonstrate the mutex must be held when setting
controls.

There is no functional change.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>