OPENMVPT: Set RTC clock source back to LSE on startup.
#define OMV_OSC_USB_CLKSOURCE RCC_USBCLKSOURCE_HSI48
#define OMV_OSC_RNG_CLKSOURCE RCC_RNGCLKSOURCE_HSI48
#define OMV_OSC_ADC_CLKSOURCE RCC_ADCCLKSOURCE_PLL3
+#define OMV_OSC_RTC_CLKSOURCE RCC_RTCCLKSOURCE_LSE
#define OMV_OSC_SPI123_CLKSOURCE RCC_SPI123CLKSOURCE_PLL3
// HSE/HSI/CSI State
