i2c: meson: add gxbb compatible string

I did state some reasons previously. Consistent rules for submitters of DT bindings and being able to trace history beyond git. Now, I guess you aren't changing the rules, but you probably aren't requesting people to split DT bindings either? You might not be aware, but we also generate a DT only tree with git-filter-branch[1] for non-kernel projects to use bindings and dts files. For that, sure they will only get the DT binding part of it, but what commit text do they get? Finally, DT maintainer acks (which from me is a review really) apply to the bindings only. Sometimes I review the drivers, but not often. So I would like the git history of my reviews to be accurate in terms of what I actually reviewed.