Update omv_boardconfig.h
change openmv4p usb clock source
// Clock Sources
#define OMV_OSC_PLL_CLKSOURCE RCC_PLLSOURCE_HSE
-#define OMV_OSC_USB_CLKSOURCE RCC_USBCLKSOURCE_PLL
+#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_SPI123_CLKSOURCE RCC_SPI123CLKSOURCE_PLL3
