xen: resume interrupts before system devices.

Impact: bugfix Xen domain restore

Otherwise the first timer interrupt after resume is missed and we never
get another.

Signed-off-by: Ian Campbell <[e-mail]>
Signed-off-by: Jeremy Fitzhardinge <[e-mail]>

drivers/xen/manage.c

···
 	gnttab_resume();
 	xen_mm_unpin_all();
 
-	sysdev_resume();
-	device_power_up(PMSG_RESUME);
-
 	if (!*cancelled) {
 		xen_irq_resume();
 		xen_console_resume();
 		xen_timer_resume();
 	}
+
+	sysdev_resume();
+	device_power_up(PMSG_RESUME);
 
 	return 0;
 }