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

[Frank Chu (Code Review)]

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

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

https://review.coreboot.org/c/coreboot/+/48497

to look at the new patch set (#4).

Change subject: mb/google/volteer: Add GPIO to drobit support
......................................................................

mb/google/volteer: Add GPIO to drobit support

Add support for gpio driver for drobit

BUG=b:175351914
BRANCH=none
TEST=emerge-volteer coreboot

Signed-off-by: FrankChu 
Change-Id: I54ba182c6da3db282961b3c72a4d2d11d1001e95
---
M src/mainboard/google/volteer/variants/drobit/Makefile.inc
A src/mainboard/google/volteer/variants/drobit/gpio.c
2 files changed, 185 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/97/48497/4