drm/xe/vf: Make VF recovery run on per-GT worker

drm/xe/vf: Make VF recovery run on per-GT worker

VF recovery is a per-GT operation, so it makes sense to isolate it to a
per-GT queue. Scheduling this operation on the same worker as the GT
reset and TDR not only aligns with this design but also helps avoid race
conditions, as those operations can also modify the queue state.

v2:
 - Fix lockdep splat (Adam)
 - Use xe_sriov_vf_migration_supported helper
v3:
 - Drop xe_gt_sriov_ prefix for private functions (Michal)
 - Drop message in xe_gt_sriov_vf_migration_init_early (Michal)
 - Logic rework in vf_post_migration_notify_resfix_done (Michal)
 - Rework init sequence layering (Michal)

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Tomasz Lis <tomasz.lis@intel.com>
Link: https://lore.kernel.org/r/20251008214532.3442967-10-matthew.brost@intel.com