Change in coreboot[master]: mb/google/volteer: Add GPIO to copano support

[Hao Chou (Code Review)]

Hello build bot (Jenkins), Martin Roth, Patrick Georgi, Caveh Jalali, Tim Wawrzynczak, Zhuohao Lee,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/48951

to look at the new patch set (#6).

Change subject: mb/google/volteer: Add GPIO to copano support
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mb/google/volteer: Add GPIO to copano support

Add support for gpio driver for copano

BUG=b:175896481
BRANCH=firmware-volteer-13672.B-main
TEST=emerge-volteer coreboot

Signed-off-by: hao_chou 
Change-Id: I1e0f730c9865ed77c7071245b071315a9c6ea4c8
---
M src/mainboard/google/volteer/variants/copano/Makefile.inc
A src/mainboard/google/volteer/variants/copano/gpio.c
2 files changed, 233 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/51/48951/6