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 <ian.campbell@citrix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

drivers/xen/manage.c

@@ -62,14 +62,15 @@ static int xen_suspend(void *data)
 	gnttab_resume();
 	xen_mm_unpin_all();
 
-	sysdev_resume();
-
 	if (!*cancelled) {
 		xen_irq_resume();
 		xen_console_resume();
 		xen_timer_resume();
 	}
 
+	sysdev_resume();
+	device_power_up(PMSG_RESUME);
+
 	return 0;
 }