Change in coreboot[master]: mb/google/dedede/var/drawcia: Add support to handle pen detection

[Chen Wisley (Code Review)]

Attention is currently required from: Furquan Shaikh, Martin Roth, Henry Sun, Evan Green, Justin TerAvest.
Hello build bot (Jenkins), Furquan Shaikh, Patrick Georgi, Martin Roth, Henry Sun, Justin TerAvest, Evan Green, Karthik Ramasubramanian,

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

https://review.coreboot.org/c/coreboot/+/49469

to look at the new patch set (#13).

Change subject: mb/google/dedede/var/drawcia: Add support to handle pen detection
......................................................................

mb/google/dedede/var/drawcia: Add support to handle pen detection

For board version 6 afterward, it will have external pull-up for
GPP_C12, and remove internal pull-up.

BUG=b:177618684
TEST=emerge-dedede coreboot, check evtest if SW_PEN_INSERTED event
(value:1/0) when insert/eject pen, and eject pen to wake system from s0ix

Signed-off-by: Wisley Chen 
Change-Id: I503873afb48384168dcd8a822c7246655898356e
---
M src/mainboard/google/dedede/variants/drawcia/Makefile.inc
A src/mainboard/google/dedede/variants/drawcia/gpio.c
M src/mainboard/google/dedede/variants/drawcia/overridetree.cb
3 files changed, 51 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/69/49469/13