drm/xe/vf: Stop applying save-restore MMIOs if VF

Currently we are blocking processing of all save-restore rules
by the VFs inside the xe_rtp_process_to_sr() function, but we
want to unblock that to allow processing of the LRC WA rules.

To avoid hitting WARNs about reading an inaccessible registers by
the VFs, stop applying save-restore MMIOs action if VF, without
relying that SR list will be always empty for the VF.

Signed-off-by: Michal Wajdeczko <[e-mail]>
Cc: Matt Roper <[e-mail]>
Reviewed-by: Matt Roper <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/xe/xe_reg_sr.c

···
 	if (xa_empty(&sr->xa))
 		return;
 
+	if (IS_SRIOV_VF(gt_to_xe(gt)))
+		return;
+
 	xe_gt_dbg(gt, "Applying %s save-restore MMIOs\n", sr->name);
 
 	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FORCEWAKE_ALL);