Damien George 71312d0bd1 stm32/usb: Allow board to select which USBD is used as the main one.
By defining MICROPY_HW_USB_MAIN_DEV a given board can select to use either
USB_PHY_FS_ID or USB_PHY_HS_ID as the main USBD peripheral, on which the
REPL will appear.  If not defined this will be automatically configured.
2018-02-01 17:47:28 +11:00
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