stm32: Fix RTC based hal tick for STM32U5

It fixes IRQ number to reflect correct name for STM32U5
It also enables additional clocks that are need to access
RTC data on STM32U5
Aldo STM32U5 does not have DBGMCU_CR_DBG_SLEEP field similar to STM32F1.

hw/mcu/stm/stm32_common/src/hal_os_tick.c

@@ -69,7 +69,7 @@ __WFI(void)
 #define SYNCH_PREDIV (32768 / (ASYNCH_PREDIV + 1) - 1)
 #define SUB_SECONDS_BITS 12
 
-#if defined(STM32L0) || defined(STM32F0)
+#if defined(STM32L0) || defined(STM32F0) || defined(STM32U5)
 #define RTC_IRQ RTC_IRQn
 #else
 #define RTC_IRQ RTC_Alarm_IRQn
@@ -320,6 +320,12 @@ os_tick_init(uint32_t os_ticks_per_sec, int prio)
  NVIC_SetPriority(RTC_IRQ, prio);
  NVIC_SetVector(RTC_IRQ, (uint32_t)RTC_Alarm_IRQHandler);
 
+#ifdef __HAL_RCC_RTCAPB_CLK_ENABLE
+ __HAL_RCC_RTCAPB_CLK_ENABLE();
+#endif
+#ifdef __HAL_RCC_RTCAPB_CLKAM_ENABLE
+ __HAL_RCC_RTCAPB_CLKAM_ENABLE();
+#endif
  /* If RTC is already on get time and date before reinit. */
  if (IS_RTC_ENABLED) {
  HAL_RTC_GetTime(&rtc, &rtc_time, RTC_FORMAT_BIN);
@@ -331,10 +337,10 @@ os_tick_init(uint32_t os_ticks_per_sec, int prio)
 
  __HAL_DBGMCU_FREEZE_RTC();
 
-#if !MYNEWT_VAL(MCU_STM32F0)
- DBGMCU->CR |= (DBGMCU_CR_DBG_SLEEP | DBGMCU_CR_DBG_STOP | DBGMCU_CR_DBG_STANDBY);
-#else
+#if MYNEWT_VAL(MCU_STM32F0) || MYNEWT_VAL(MCU_STM32U5)
  DBGMCU->CR |= (DBGMCU_CR_DBG_STOP | DBGMCU_CR_DBG_STANDBY);
+#else
+ DBGMCU->CR |= (DBGMCU_CR_DBG_SLEEP | DBGMCU_CR_DBG_STOP | DBGMCU_CR_DBG_STANDBY);
 #endif
 
  OS_ENTER_CRITICAL(sr);