Add support for SparkFun Pro nRF52840 Mini #361
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Checklist
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UF2_BOARD_IDin your board.h follow correct format from uf2 specsThis checklist items that are not applicable to your PR can be deleted.
Description of Change
This is the spiritual successor of #62.
I started from the board definition of the PCA10056, which SparkFun says this board was based off of. Then, I copied over pin information from definitions in their repo. To find the appropriate VID and PIDs, I looked at the Arduino board definition.
There is only one switch aside from RST on the board, so I tied FRST to pin 17. The resultant bootloader gets into DFU mode correctly and the blue LED on the board breathes.