drm/xe: Clear pending_disable before signaling suspend fence

In the schedule-disable done path for suspend, we
signal the suspend fence before clearing pending_disable.

That wakeup can let suspend_wait complete and resume be queued
immediately. The resume path may then reach enable_scheduling()
while pending_disable is still set and hit the
!exec_queue_pending_disable(q) assertion.

Fix this by clearing pending_disable before signaling
the suspend fence, so any resumed transition observes a
consistent state.

Fixes: 87651f31ae4e ("drm/xe/guc_submit: fix race around suspend_pending")
Cc: stable@vger.kernel.org # v7.0+
Signed-off-by: Tangudu Tilak Tirumalesh <tilak.tirumalesh.tangudu@intel.com>
Reviewed-by: Thomas Hellstrom <thomas.hellstrom@linux.intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patch.msgid.link/20260603065217.3131066-3-tilak.tirumalesh.tangudu@intel.com

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