[v3.7.0-rc3] stm32u5x pm_state_exit_post_ops Unsupported power state 2

[zafersn]

Even though the state 2 is defined as a PM_STATE_SUSPEND_TO_IDLE, i got Unsupported power state 2 log print. So I noticed that it seems missing break; keyword.

https://github.com/zephyrproject-rtos/zephyr/blob/main/soc/st/stm32/stm32u5x/power.c#L149

/* Handle SOC specific activity after Low Power Mode Exit */
void pm_state_exit_post_ops(enum pm_state state, uint8_t substate_id)
{
	switch (state) {
	case PM_STATE_SUSPEND_TO_IDLE:
		if (substate_id <= 3) {
			LL_LPM_DisableSleepOnExit();
			LL_LPM_EnableSleep();
#ifdef CONFIG_STM32_STOP3_LP_MODE
		} else if (substate_id == 4) {
			stm32_clock_control_standby_exit();

			LL_ICACHE_SetMode(LL_ICACHE_1WAY);
			LL_ICACHE_Enable();
			while (LL_ICACHE_IsEnabled() == 0U) {
			}

			LL_LPM_DisableSleepOnExit();
			LL_LPM_EnableSleep();
#endif
		} else {
			LOG_DBG("Unsupported power substate-id %u",
							substate_id);
		}
	break;
	case PM_STATE_STANDBY:
		/* To be tested */
		LL_LPM_EnableSleep();
	case PM_STATE_SUSPEND_TO_RAM:
		__fallthrough;
	case PM_STATE_SUSPEND_TO_DISK:
		__fallthrough;
	default:
		LOG_DBG("%d Unsupported power state %u", __LINE__,state);
		break;
	}
	/* need to restore the clock */
	stm32_clock_control_init(NULL);

	/*
	 * System is now in active mode.
	 * Reenable interrupts which were disabled
	 * when OS started idling code.
	 */
	irq_unlock(0);
}