Magf - uploaded patch set #3 to this change.

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mb/google/kukui: fix damu touchscreen reset sequence

Damu touchscreen is a typical hid-over-i2c device and its reset pin
has a sequence requirement (T5) > 500us. Kernel hid-over-i2c driver
has no interface to support a reset pin, so current implementation
will be using a default pull down pin and rely on kernel to pull
it to high to make it exit reset. In warm boot, we have to pull it
low in firmware stage so kernel can release it to get a valid
reset > 500us.

BUG=b:159688118
BRANCH=kukui
TEST=build and boot damu device, when warm reboot, we can get a
     valid reset sequence which is greater than 500us.

Change-Id: I069f5ef3e9477410d5349e5a702a4fbc14c201ed
Signed-off-by: Paul Ma <magf@bitland.crop-partner.google.com>
---
M src/mainboard/google/kukui/gpio.h
M src/mainboard/google/kukui/mainboard.c
2 files changed, 9 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/19/43319/3

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