atmel-samd: Reset TCC channel in use array on reset.
atmel-samd: Reset TCC channel in use array on reset.

This fixes spurious "All timers in use" exceptions. Thanks to
@ladyada for finding this issue.

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