drm/xe/vf: Rebase CCS save/restore BB GGTT addresses

drm/xe/vf: Rebase CCS save/restore BB GGTT addresses

Rebase the CCS save/restore BB's GGTT addresses during VF post-migration
recovery by setting the software ring tail to zero, the LRC ring head to
zero, and rewriting the jump-to-BB instructions.

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Satyanarayana K V P <satyanarayana.k.v.p@intel.com>
Link: https://lore.kernel.org/r/20251008214532.3442967-34-matthew.brost@intel.com