[L] Change in coreboot[master]: mb/dell: Add OptiPlex 7020/9020 port

[Máté Kukri (Code Review)]

Attention is currently required from: Angel Pons, Michael Büchler, Michał Żygowski, Stefan Reinauer.

Máté Kukri has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/55232?usp=email )

Change subject: mb/dell: Add OptiPlex 7020/9020 port
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Patch Set 25:

(1 comment)

Patchset:

PS25:
> Thank you for your work on this port! I tested this on a 9020 mini tower (MT). […]

I am glad it works in the mini tower too, I'll hope you'll get some use out of it. I only own the SFF board so never had the opportunity to test that.

As for the `overridetree.cb`s, it is definitely the right approach. My original plan was exactly that, to have 3 variants from the USFF, SFF, and MT.

However I don't really use the port anymore, so it probably needs a new maintainer to be completed and merged at this point.