nrf: Implement RUNMODE_BOOTLOADER and RUNMODE_SAFE_MODE
nrf: Implement RUNMODE_BOOTLOADER and RUNMODE_SAFE_MODE

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