drm/xe: Move xe_ttm_sys_mgr_init() downwards.

Now that all previous allocations are gone, ensure no new allocations
will ever be done before xe_display_init_early(), by moving the call
that allows allocations downwards.

Reviewed-by: Lucas De Marchi <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Maarten Lankhorst <[e-mail]>

drivers/gpu/drm/xe/xe_device.c

···
 	if (err)
 		return err;
 
-	err = xe_ttm_sys_mgr_init(xe);
-	if (err)
-		return err;
-
 	for_each_gt(gt, xe, id) {
 		err = xe_gt_init_early(gt);
 		if (err)
···
 		if (err)
 			return err;
 	}
+
+	/*
+	 * Allow allocations only now to ensure xe_display_init_early()
+	 * is the first to allocate, always.
+	 */
+	err = xe_ttm_sys_mgr_init(xe);
+	if (err)
+		return err;
 
 	/* Allocate and map stolen after potential VRAM resize */
 	err = xe_ttm_stolen_mgr_init(xe);