Fix motor board USB bug

[WillB97]

There's bug with the rpi.gpio-common udev rule that causes the root hub to be made only readable by root when the motor board is plugged in too far down the USB tree.

See raspberrypi/linux#3779 (comment) and https://groups.google.com/g/linux.debian.bugs.dist/c/5jI9dDZgfUU

The mitigation for this is to remove the rpi.gpio-common package. We are already including the required udev rule and installing RPi.GPIO in pyenv, so this is the only change required.