dmtimer_clockevent_shutdown
dmtimer_clockevent_shutdown(evt);
dev->set_state_shutdown = dmtimer_clockevent_shutdown;
dev->set_state_oneshot = dmtimer_clockevent_shutdown;
dev->set_state_oneshot_stopped = dmtimer_clockevent_shutdown;
dev->tick_resume = dmtimer_clockevent_shutdown;