Change in coreboot[master]: acpi: Add support to generate upep structure

[Raul Rangel (Code Review)]

Attention is currently required from: Lance Zhao, Martin Roth, Akshu Agrawal, Marshall Dawson, Jason Glenesk, Matt Papageorge, Karthik Ramasubramanian.
Raul Rangel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/52037 )

Change subject: acpi: Add support to generate upep structure
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Patch Set 6:

(1 comment)

File src/acpi/acpigen_upep.c:

https://review.coreboot.org/c/coreboot/+/52037/comment/23a7fa69_b96ad4cb 
PS6, Line 88: acpigen_write_method
How would we feel if we instead wrote all this in .asl and only left the constraint generation or what ever needs to be dynamically generated using acpigen?

Intel has some of their PEP implementation in asl: https://source.chromium.org/chromiumos/chromiumos/codesearch/+/main:src/thir...

Reading acpigen code is tough, and it's also not checked by the acpi compiler.