Fix comments in board DTS files referring to AN521 tables defining memory areas, and choose node label names that more accurately reflect the entries of interest in those tables.

@ktown this reflects the first couple of things we talked about. I thought about how to plumb the cpu1 start address from DT all the way through, but I think that's going to require system devicetree. It's an interesting use case that I hadn't considered, though, and will definitely affect the design.

I think you're looking for @microbuilder sorry (terrible name from a company I ran lifetimes ago). I'm sure someone is very confused about who you are and what you're tagging them for. 😉

@microbuilder my mistake on the username :). Sorry for confusion; I was on autopilot and used your discord handle.

Suggestions applied, thanks. I expect I'll have a system DT demo for this board by end of day.

This pull request has been marked as stale because it has been open (more than) 60 days with no activity. Remove the stale label or add a comment saying that you would like to have the label removed otherwise this pull request will automatically be closed in 14 days. Note, that you can always re-open a closed pull request at any time.

Rebased with no changes to see if twister passes this time