[M] Change in coreboot[master]: mb/google/myst: Enable chromeOS EC

[Jon Murphy (Code Review)]

Attention is currently required from: Raul Rangel, Eric Lai, Tim Van Patten, Karthik Ramasubramanian, Mark Hasemeyer.

Jon Murphy has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/74099 )

Change subject: mb/google/myst: Enable chromeOS EC
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Patch Set 5:

(1 comment)

File src/mainboard/google/myst/Kconfig:

https://review.coreboot.org/c/coreboot/+/74099/comment/01e79c5d_27ddf471 
PS5, Line 19: 
            : config CHROMEOS
            : 	select EC_GOOGLE_CHROMEEC_SWITCHES
> Are we targeting non-chromeos builds? IMO we should be using verstage after bootblock for bringup in […]

We're not trying to get a non-chromeos build working, it's just a vboot config item and it will end up being moved later.  I'm not sure I follow the verstage after bootblock comment.  If you look at line 50, that's how we hadd things setup for Skyrim bringup too