Possibly use a "baseboard" to unify hx20 and hx30

[DHowett]

Depending on how similar the hx* boards are, it may be possible--and perhaps advantageous!--to unify their implementations as a baseboard (see the baseboard directory for other examples.)

That would make it easier to abstract, say, the input cover/key layout and PS/2 emulation bits and drive bug fixes to both platforms simultaneously. Similar thoughts about the UCSI implementation, if the hx20/30 share one of those.

[DHowett]

Barring this, perhaps it would be nice if the hx20 and hx30 board directories weren't on separate branches? They don't necessarily need to be unified, but... as the potential author of a number of changes that should apply to both 11th and 12th gen boards, it complicates deployment and development to have them on separate branches.