The odu-gpiotool is a small script created by roh to selectively reset
individual peripherals of the system by the administrator. It originates
from ticket https://projects.sysmocom.de/ortelius/issues/655
We use the new sysfs file to obtain the board version number and
configure the port swapping accordingly. If the board_version sysfs
attribute is not present, we default to v2.
We also integrate resetting the hub chip from within this tool right
befeore writing the new register values via I2C.