Change in coreboot[master]: ChromeOS: Promote variant_cros_gpio()

[Tim Wawrzynczak (Code Review)]

Attention is currently required from: Jason Glenesk, Marshall Dawson, Nick Vaccaro, Kyösti Mälkki, Fred Reitberger, Karthik Ramasubramanian, Felix Held.
Tim Wawrzynczak has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/58897 )

Change subject: ChromeOS: Promote variant_cros_gpio()
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Patch Set 17: Code-Review+2

(2 comments)

Patchset:

PS17: 
Nice! This removes the common->mainboard->common code jump that the old path went through 😊

File src/vendorcode/google/chromeos/chromeos.h:

https://review.coreboot.org/c/coreboot/+/58897/comment/80b39527_7c44a84e 
PS17, Line 100: variant_cros_gpios
suggestion: now in maybe another patch, a better name might be
`mainboard_cros_gpios()`