Change in coreboot[master]: soc/intel/denverton_ns: Replace EDK2 code

[Arthur Heymans (Code Review)]

Attention is currently required from: Jeff Daly, Patrick Rudolph, Mariusz Szafrański, Suresh Bellampalli, Vanessa Eusebio.
Arthur Heymans has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/62985 )

Change subject: soc/intel/denverton_ns: Replace EDK2 code
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Patch Set 3: Code-Review+2