ieee802154: ca8210: Drop spurious WQ_UNBOUND from alloc_ordered_workqueue() call

Workqueue is in the process of cleaning up the distinction between unbound
workqueues w/ @nr_active==1 and ordered workqueues. Explicit WQ_UNBOUND
isn't needed for alloc_ordered_workqueue() and will trigger a warning in the
future. Let's remove it. This doesn't cause any functional changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Message-ID: <ZcF1El7fn5xkeoB1@slm.duckdns.org>
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>