drm/i915/mtl: Update Wa_22018931422

Commit 78cc55e ("drm/i915/mcr: Hold GT forcewake during steering
operations") introduced the workaround which was in early stages. With a
valid lineage number update Workaround for future tracking.

Cc: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231116212511.1760446-1-radhakrishna.sripada@intel.com

drivers/gpu/drm/i915/gt/intel_gt_mcr.c

@@ -388,8 +388,7 @@ void intel_gt_mcr_lock(struct intel_gt *gt, unsigned long *flags)
 		 * registers.  This wakeref will be released in the unlock
 		 * routine.
 		 *
-		 * This is expected to become a formally documented/numbered
-		 * workaround soon.
+		 * Wa_22018931422
 		 */
 		intel_uncore_forcewake_get(gt->uncore, FORCEWAKE_GT);