CLI: Allow generation of both LED and RGB Matrix config

[fauxpark]

Description

While it is true that LED and RGB Matrix are mutually exclusive (mainly due to sharing of g_led_config), I have encountered this issue as a bit of an edge case with my testbed folder - Features are simply enabled in the keymap-level rules.mk, with most of the actual config living in the top-level or "dev-board"-level info.jsons.

Since all of the LED/RGB Matrix config generated by the CLI is protected by feature ifdefs anyway, it should be safe to have both at once.

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).