[M] Change in coreboot[main]: mb/google/{brya,hades}: use soc index for variant_update_power_limits()

[Martin L Roth (Code Review)]

Attention is currently required from: Dinesh Gehlot, Kapil Porwal, Nick Vaccaro, Paul Menzel, SH Kim, Subrata Banik, Sumeet R Pawnikar, Varshit Pandya.

Martin L Roth has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/81436?usp=email )

Change subject: mb/google/{brya,hades}: use soc index for variant_update_power_limits()
......................................................................

Patch Set 11: Code-Review+2