[XS] Change in coreboot[master]: soc/intel/xeon_sp: Use MRC_STASH_TO_CBMEM config

[Johnny Lin (Code Review)]

Attention is currently required from: Andrey Petrov, Arthur Heymans, Christian Walter, Kapil Porwal, Lean Sheng Tan, Nill Ge, Reka Norman, Shuo Liu, Subrata Banik, TangYiwei, Tim Chu.

Johnny Lin has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/77557?usp=email )

Change subject: soc/intel/xeon_sp: Use MRC_STASH_TO_CBMEM config
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Patch Set 3:

(1 comment)

Patchset:

PS1:
> > MRC_WRITE_NV_LATE doesn't work. […]

IIRC moving to fsp-s is because it has faster booting speed for server platform.