Damien George 11657f2f20 stm32/system_stm32f0: Add support for using HSE and PLL as SYSCLK.
To configure the SYSCLK on an F0 enable one of:

    MICROPY_HW_CLK_USE_HSI48
    MICROPY_HW_CLK_USE_HSE
    MICROPY_HW_CLK_USE_BYPASS
2019-04-18 16:00:45 +10:00
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