boards: mps2_an521: clean up memory map

[mbolivar-nordic]

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.

@microbuilder 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.

[microbuilder]

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. 😉

[mbolivar-nordic]

@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.

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[mbolivar-nordic]

Rebased with no changes to see if twister passes this time