Input: psmouse - remove dedicated kpsmoused workqueue

The only user of psmouse_queue_work() and therefore kpsmoused workqueue
is psmouse-base itself, when it tries to schedule the resync work. Since
resyncing is not going to race with itself we no longer need the
dedicated ordered workqueue.

Remove it and switch to using regular (non-delayed) work structure
scheduled on the default workqueue.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>