Remove 'adafruit-board-toolkit' since we don't actually need it.
Replace 'adafruit-circuitpython-busdevice' with 'adafruit-blinka' since we no longer need I2CDevice(). Unfortunately this doesn't really save anything since blinka depends on busdevice. But it makes it a little clearer what our own dependencies are and removes one layer of circular dependencies.
Remove 'adafruit-board-toolkit' since we don't actually need it.
Replace 'adafruit-circuitpython-busdevice' with 'adafruit-blinka' since we no longer need I2CDevice(). Unfortunately this doesn't really save anything since blinka depends on busdevice. But it makes it a little clearer what our own dependencies are and removes one layer of circular dependencies.