[coreboot-gerrit] Change in coreboot[master]: mb/google/brya: Add FPMCU power control

[EricR Lai (Code Review)]

Attention is currently required from: Furquan Shaikh, Tim Wawrzynczak.
EricR Lai has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/52185 )

Change subject: mb/google/brya: Add FPMCU power control
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Patch Set 1:

(1 comment)

Patchset:

PS1: 
@Furquan, I can try to add new FPMCU driver, but here we have UART and SPI. Should I add two or combine together? And we do need _PS0 and _PS5 or only _ON method?