Convert Wasdat Code custom matrix to SN74x138 driver

[fauxpark]

Description

A followup to #16217.

This board is similar to the Wasdat, but the column setup is a little different. According to the schematic, D4 is connected to one of the 74HC138's enable pins, and all output pins are connected to a column (whereas on the Wasdat the IC is always enabled, and only 7 of the 8 outputs are connected, with address 0 being set when a non-demux column is selected).

@evyd13 if you still have one of these, would you mind testing it, or pointing someone else who has one here?

Types of Changes

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

Issues Fixed or Closed by This PR

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).

[evyd13]

@evyd13 if you still have one of these, would you mind testing it, or pointing someone else who has one here?

Mine is with a friend of mine. If yours works it should be good to go 👍

[fauxpark]

I don't have a Code, just a normal WASD V2 with a Wasdat. I'm only able to verify the latter, although the matrix.c implementation is very nearly identical, but it would be good to get proper confirmation.