configure LPTIM4 for BSP_POWER

Core/Inc/stm32h7xx_it.h

@@ -70,6 +70,7 @@ void SDMMC1_IRQHandler(void);
 void OTG_HS_EP1_OUT_IRQHandler(void);
 void OTG_HS_EP1_IN_IRQHandler(void);
 void OTG_HS_IRQHandler(void);
+void LPTIM4_IRQHandler(void);
 /* USER CODE BEGIN EFP */
 
 /* USER CODE END EFP */