drm/xe/vf: Abort H2G sends during VF post-migration recovery

drm/xe/vf: Abort H2G sends during VF post-migration recovery

While VF post-migration recovery is in progress, abort H2G sends with
-ECANCEL. These messages are treated as lost, and TLB invalidation
errors are suppressed. During this phase, the H2G channel is down, and
VF recovery requires the CT lock to proceed.

v3:
 - Use xe_gt_recovery_inprogress (Michal)

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://lore.kernel.org/r/20251008214532.3442967-11-matthew.brost@intel.com