common: move workqueue handling from poller_call() to sched()

Workqueues are run out of poller_call, not because of a dependency, but
because when they were added, poller_call was directly called from
is_timeout.

With the addition of bthreads, there is now a general resched() function
that runs pollers and switches between bthreads. It makes sense to move
workqueue handling there as well to keep scheduling matter contained in
a single function. Do so.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20210622082617.18011-4-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

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