Fixup kprepublic/bm60hsrgb/rev2
- Remove RGBLight configuration and throw error if RGBLight & RGB Matrix
are enabled together - the WS2812 driver cannot be used for RGBLight
as it is being used by this keyboard's custom RGB Matrix driver
- Migrate RGB Matrix configuration to DD
- Migrate default keymap to JSON
- Use short SPDX license headers
* Migrate `LAYOUTS` to data driven, 0-9
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* Migrate `LAYOUTS` to data driven, handwired
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