clocksource/drivers/armada-370-xp: Remove clockevents shutdown call on offlining

The clockevents core already detached and unregistered it at this stage.

Signed-off-by: Frederic Weisbecker <[e-mail]>
Signed-off-by: Thomas Gleixner <[e-mail]>
Link: https://lore.kernel.org/all/[e-mail]

drivers/clocksource/timer-armada-370-xp.c

···
 {
 	struct clock_event_device *evt = per_cpu_ptr(armada_370_xp_evt, cpu);
 
-	evt->set_state_shutdown(evt);
 	disable_percpu_irq(evt->irq);
 	return 0;
 }