ChibiOS conf migrations... take 10

[tzarc]

Description

Config migrations and custom board removals for the last batch of boards left outstanding in the repository.

sha1sums all match.

                          akegata_denki/device_one - 0d9f891416decbbb533c6c1147632ef7c55a2d9f
                                    chavdai40/rev1 - 06bca6ec34948c8005e73254299488cdba3429f8
                                    chavdai40/rev2 - f55650a8d7aa755eb72564e95a144910dd902a73
                                     ergodox_stm32 - 04433b80e4cd231c15163ace77428db72b5483ad
                                              jm60 - a127e6cfccad74ed1a9e47e9213dc41cf0d26f1d
                                     matrix/m20add - e2e556dad666ed9b1eea09e46d0eb14e19bda8b8
                                       matrix/noah - c6fd3caf0b7d444085283d4f0a9204ab283d5202

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Keyboard (addition or update)
• Keymap/layout/userspace (addition or update)
• Documentation

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).