Mechwild OBE/Waka60: Fix build warnings

[fauxpark]

Description

These boards have a subrev named "eeprom" which switches the EEPROM driver to an I2C one, but they only have a rules.mk and the keyboard.json is in the parent folder. While mechwild/{obe,waka60}/f4{0,1}1 all build correctly, the status page shows "invalid keyboard.json location" warnings for mechwild/{obe,waka60}/f4{0,1}1/eeprom.

Types of Changes

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

Issues Fixed or Closed by This PR

Checklist

• [x] My code follows the code style of this project: C, Python
• [x] 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.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] I have tested the changes and verified that they work and don't break anything (as well as I can manage).