Mixer: use MP_LIKELY macro instead of locally brewed one
Mixer: use MP_LIKELY macro instead of locally brewed one

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