f16e4be3fa
Before this patch the UART baudrate on F0 MCUs was wrong because the stm32lib SystemCoreClockUpdate sets SystemCoreClock to 8MHz instead of 48MHz if HSI48 is routed directly to SYSCLK. The workaround is to use HSI48 -> PREDIV (/2) -> PLL (*2) -> SYSCLK. Fixes issue #5049.