[M] Change in coreboot[master]: drivers/vpd, cpu/x86/smm: Add VPD support for SMM

[Johnny Lin (Code Review)]

Attention is currently required from: Arthur Heymans, Marc Jones, Subrata Banik, Ed Sharma, Christian Walter, Shuming Chu (Shuming), Michael Niewöhner, Kyösti Mälkki.

Johnny Lin has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/67092 )

Change subject: drivers/vpd, cpu/x86/smm: Add VPD support for SMM
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Patch Set 4:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/67092/comment/c5d0f334_897b4ef9 
PS4, Line 9: The main purpose is to be able to dynamically configure system during
           : SMM boot time via VPD.
> > It's safer to pass each config variable ex. […]

There is one RAS related config in our private repo https://review.coreboot.org/c/coreboot-spr-sp/+/66858
Besides that config, so far no other variables needed for SMM runtime config yet.
On the other hand, since RAS SMM codes won't be upstreamed, I feel that we can keep such kinds of customizations in the private repo.