Refactor codebase to make use of config files instead of letting every
script re-implement the same logic over and over again.

With this commit, eight boards are supported:

 - MNT Reform 2
 - MNT Reform 2 HDMI
 - MNT Reform 2 with BPI-CM4 Module
 - MNT Reform 2 with LS1028A Module
 - MNT Reform 2 with RCORE RK3588 Module
 - MNT Reform 2 with i.MX8MP Module
 - MNT Pocket Reform with BPI-CM4 Module
 - MNT Pocket Reform with i.MX8MP Module