[coreboot-gerrit] [XS] Change in coreboot[main]: mb/google/rex: Select MIPI pre-prod if MTL pre-prod Si set

[Jamie Ryu (Code Review)]

Attention is currently required from: Eran Mitrani, Kapil Porwal, Paul Menzel, Subrata Banik, Tarun.

Jamie Ryu has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/77993?usp=email )

Change subject: mb/google/rex: Select MIPI pre-prod if MTL pre-prod Si set
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Patch Set 2: Code-Review+1