rp2: Enable uerrno module.
rp2: Enable uerrno module.

Fixes #6991.

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