Change in coreboot[master]: mb/google/dedede/var/bugzzy: Initialize display signals on user mode

[SH Kim (Code Review)]

Attention is currently required from: Henry Sun, Edward Doan, Karthik Ramasubramanian.
SH Kim has uploaded a new patch set (#3) to the change originally created by shkim. ( https://review.coreboot.org/c/coreboot/+/60190 )

Change subject: mb/google/dedede/var/bugzzy: Initialize display signals on user mode
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mb/google/dedede/var/bugzzy: Initialize display signals on user mode

Bugzzy uses panel-built-in touch screen, it needs to set panel power
and reset signal to high for touch screen to work.

On user mode, coreboot doesn't initialize graphics since there is no
screen display before OS. So we would add a WA to initialize required
signals on user mode.

BUG=b:205496327
BRANCH=dedede
TEST=Verified touch screen worked with test coreboot
     and new touch screen firmware

Signed-off-by: Seunghwan Kim 
Change-Id: Iaa4d16deb932f43ae1ab33ff5b4e74120ab670db
---
M src/mainboard/google/dedede/variants/bugzzy/Makefile.inc
A src/mainboard/google/dedede/variants/bugzzy/ramstage.c
2 files changed, 81 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/90/60190/3