[XS] Change in coreboot[main]: mb/google/rex/var/deku: Enable RTD3 for SSD

[Subrata Banik (Code Review)]

Attention is currently required from: Curtis Chen, Dinesh Gehlot, Eran Mitrani, Jakub Czapiga, Kapil Porwal, Tarun.

Subrata Banik has posted comments on this change by Curtis Chen. ( https://review.coreboot.org/c/coreboot/+/84452?usp=email )

Change subject: mb/google/rex/var/deku: Enable RTD3 for SSD
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Patch Set 2:

(1 comment)

Patchset:

PS1:
> Yes,they are the same changes for similar causes.
> Should we enable for Karis together,too?
> Or enable it separately and please Karis ODM do some verification?

if you have time, can you pleaee push the CL for Karis as well and add @[e-mail] for review?