[Keyboard] Add BM65HSRGB Rev2

[zniqco]

Description

I added some code to @peepeetee's work to make it work.
I don't have an ISO layout board so I couldn't write it.

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

• Add bm65hsrgb/rev2 #15060
• KPRepublic BM65V2 addition request #15081

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).

[github-actions]

Thank you for your contribution!
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For maintainers: Please label with bug, awaiting review, breaking_change, in progress, or on hold to prevent the issue from being re-flagged.

[drashna]

The combined implementation here is ... messy, at best. Really, this should be rgblight and rgb matrix, and not both. Or worst case, it shouldn't be conditional like this.