drm/xe/vf: Defer fixups if migrated twice fast

drm/xe/vf: Defer fixups if migrated twice fast

If another VF migration happened during post-migration recovery,
then the current worker should be finished to allow the next
one start swiftly and cleanly.

Check for defer in two places: before fixups, and before
sending RESFIX_DONE.

Signed-off-by: Tomasz Lis <tomasz.lis@intel.com>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241104213449.1455694-6-tomasz.lis@intel.com
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>