rp2/rp2_flash: Prevent MICROPY_HW_FLASH_STORAGE_BASE being set negative.
rp2/rp2_flash: Prevent MICROPY_HW_FLASH_STORAGE_BASE being set negative.

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