tools/ci.sh: Add mpy-cross build to nrf port.
tools/ci.sh: Add mpy-cross build to nrf port.

bvernoux/micropython,adafruit/circuitpython,bvernoux/micropython,adafruit/circuitpython,adafruit/circuitpython,adafruit/circuitpython,bvernoux/micropython,adafruit/circuitpython,bvernoux/micropython,adafruit/circuitpython,bvernoux/micropython