[coreboot-gerrit] Change in coreboot[master]: mb/google/guybrush: allow MKBP devices and disable TBMC device

[Rob Barnes (Code Review)]

Attention is currently required from: Paul Menzel, Kenneth Chan.
Rob Barnes has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/63394 )

Change subject: mb/google/guybrush: allow MKBP devices and disable TBMC device
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Patch Set 1:

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/63394/comment/f85ae95e_3ee25923 
PS1, Line 9: Enable MKBP (Matrix Keyboard Protocol) interface for all guybrush family
           : to use for buttons and switches.
> Why is that better? What problem does it solve?

MKBP is needed to properly inhibit volume keys.
EC has already been switched to sending MKBP events, so some functionality is broken without this change.

Patchset:

PS1:
> Please test `firmware_ECPowerButton` and verify it passes with this CL.

Confirmed passing on guybrush variant.