clocksource/drivers/arm_global_timer: 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/arm_global_timer.c

···
 {
 	struct clock_event_device *clk = this_cpu_ptr(gt_evt);
 
-	gt_clockevent_shutdown(clk);
 	disable_percpu_irq(clk->irq);
 	return 0;
 }