drm/i915 - Fix double lock deadlock

* Fix an incorrect use wq_lock which was accidently double-locking instead
  of unlocking around a sleep.

* Fixes X lockups overnight in the presence of xscreensaver.  'gears'
  seems to trigger it.
Remove duplicates in usbdevs, urtwn(4) and devd(8)'s usb.conf.
kernel - Rule out vkernels from config hook delays.