atmel-samd/samd51: Implement samd.clock
atmel-samd/samd51: Implement samd.clock

Fill out the dummy implementation.

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