[XS] Change in coreboot[main]: mb/google/brox/var/greenbayupoc: Add fw_config field for storage

[Shelley Chen (Code Review)]

Attention is currently required from: Eren Peng, Ivan Chen, Nick Vaccaro.

Shelley Chen has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/81833?usp=email )

Change subject: mb/google/brox/var/greenbayupoc: Add fw_config field for storage
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Patch Set 2:

(1 comment)

Patchset:

PS2:
> Just want to clarify how we would like to manage it on brox. […]

I understand what you're saying.  I personally don't have a strong preference to keeping the fw_config definitions out of baseboard.  I cc'ed Nick though.  I think that he mentioned when brox started out that he preferred having the fw_config bits in the variant so that all variants didn't have to have the CBI fields in the same bits.  Nick, what do you think?