nRF: Handle SPEAKER_ENABLE_PIN
nRF: Handle SPEAKER_ENABLE_PIN

.. the existing code, which was never activated by the preprocessor,
wasn't quite right.

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