tools/autobuild: Add auto build for GENERIC_C3_USB.
tools/autobuild: Add auto build for GENERIC_C3_USB.

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