Change in coreboot[master]: mb/google/volteer: Create drobit variant

[Frank Chu (Code Review)]

Hello Patrick Georgi, Martin Roth,

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

https://review.coreboot.org/c/coreboot/+/47358

to look at the new patch set (#2).

Change subject: mb/google/volteer: Create drobit variant
......................................................................

mb/google/volteer: Create drobit variant

Create the drobit variant of the volteer.

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

Signed-off-by: Frank Chu 
Change-Id: Ib3dca73dea26c0d267d8e0e725d712f750810b06
---
A src/mainboard/google/volteer/variants/drobit/Makefile.inc
A src/mainboard/google/volteer/variants/drobit/gpio.c
A src/mainboard/google/volteer/variants/drobit/include/variant/ec.h
A src/mainboard/google/volteer/variants/drobit/include/variant/gpio.h
A src/mainboard/google/volteer/variants/drobit/memory.c
A src/mainboard/google/volteer/variants/drobit/memory/Makefile.inc
A src/mainboard/google/volteer/variants/drobit/memory/dram_id.generated.txt
A src/mainboard/google/volteer/variants/drobit/memory/mem_list_variant.txt
A src/mainboard/google/volteer/variants/drobit/overridetree.cb
9 files changed, 532 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/58/47358/2