xen: flag xen_drm_front to be not essential for system boot

Similar to the virtual frame buffer (vfb) the pv display driver is not
essential for booting the system. Set the respective flag.
Signed-off-by: NJuergen Gross <jgross@suse.com>
Reviewed-by: NOleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Reviewed-by: NBoris Ostrovsky <boris.ostrovsky@oracle.com>
Link: https://lore.kernel.org/r/20211022064800.14978-3-jgross@suse.comSigned-off-by: NBoris Ostrovsky <boris.ostrovsky@oracle.com>

drivers/gpu/drm/xen/xen_drm_front.c

@@ -773,6 +773,7 @@ static struct xenbus_driver xen_driver = {
 	.probe = xen_drv_probe,
 	.remove = xen_drv_remove,
 	.otherend_changed = displback_changed,
+	.not_essential = true,
 };
 
 static int __init xen_drv_init(void)