ports/nrf: Add Particle Xenon board (NRF52840)#5041

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jimmo wants to merge 3 commits intomicropython:masterfrom

jimmo:nrf-particle-xenon-board

Commits on Aug 28, 2019

ports/nrf/boards/make-pins.py: Fix generation of board pins to use the correct index.
jimmo
committed
ports/nrf/Makefile: Add support for flashing with a Black Magic Probe.
jimmo
committed
ports/nrf/boards: Add Particle Xenon board (nrf52840)
jimmo
committed