[nrf fromtree] soc: nordic: nrf54h: power: Add idle tracing calls

Add calls to sys_trace_idle and sys_trace_idle_exit in nrf54h specific
idle states to allow measuring CPU load on nrf54h20 when power
management is enabled.

Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no>
(cherry picked from commit 37fe7504ce1791976cae5cfe8d8fe0f03b122d36)

Author: nordic-krch

soc/nordic/nrf54h/power.c

@@ -175,17 +175,21 @@ void pm_state_set(enum pm_state state, uint8_t substate_id)
 {
 	if (state == PM_STATE_SUSPEND_TO_IDLE) {
 		__disable_irq();
+		sys_trace_idle();
 		s2idle_enter(substate_id);
 		/* Resume here. */
 		s2idle_exit(substate_id);
+		sys_trace_idle_exit();
 		__enable_irq();
 	}
 #if defined(CONFIG_PM_S2RAM)
 	else if (state == PM_STATE_SUSPEND_TO_RAM) {
 		__disable_irq();
+		sys_trace_idle();
 		s2ram_enter();
 		/* On resuming or error we return exactly *HERE* */
 		s2ram_exit();
+		sys_trace_idle_exit();
 		__enable_irq();
 	}
 #endif