Start examples using low power API

[peterharperuk]

No description provided.

[will-v-pi]

It might be better to use persistent data here, so that it always sets the time when run? Otherwise when you load this repeatedly using picotool, the time will keep going up and never be reset to the start time

I think this would work

Suggested change

	if (!aon_timer_is_running()) {
	low_power_start_aon_timer_at_time_ms(1776858754000);
	}
	static bool __persistent_data(aon_timer_started);
	if (!aon_timer_started) {
	low_power_start_aon_timer_at_time_ms(1776858754000);
	aon_timer_started = true;
	}