drm/xe: Kick the rebind worker from preempt fence signaling
Preempt fences are allowed to be waited on by waiters that don't know or simply can't kick the rebind worker. Kick the rebind worker from preempt fence signaling, and use the system unbound wq to avoid vm rebinds unnecessarily blocking eachother.
This fixes issue #152 (closed).
Signed-off-by: Thomas Hellström thomas.hellstrom@linux.intel.com