Change in coreboot[master]: mb/google/dedede/var/magolor: Add stylus function

[Ren Kuo (Code Review)]

Attention is currently required from: Evan Green, Ren Kuo, Paul Menzel, Aseda Aboagye, Tyler Wang.
Hello build bot (Jenkins), Evan Green, Aseda Aboagye, Tyler Wang, Karthik Ramasubramanian,

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

https://review.coreboot.org/c/coreboot/+/60185

to look at the new patch set (#3).

Change subject: mb/google/dedede/var/magolor: Add stylus function
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mb/google/dedede/var/magolor: Add stylus function

Add the stylus field in fw_config.
Update devicetree and gpio to handle stylus pen detection.

BUG=b:167983049
TEST=Build firmware and check behavior as following:
     1) Set the fw_config "bit4=1" for pen present:
     	Wake up from suspend when pen is removed from the garage.
     	Present the stylus menu when pen is removed from the garage.
     2) Set the fw_config "bit4=0" for pen absent:
        Wake up and present menu will not work when pen is removed
    form the garage.

Change-Id: I62489bb289b18f9aa0823005224eda3ef5218e03
Signed-off-by: Ren Kuo 
---
M src/mainboard/google/dedede/variants/baseboard/devicetree.cb
M src/mainboard/google/dedede/variants/magolor/Makefile.inc
A src/mainboard/google/dedede/variants/magolor/gpio.c
M src/mainboard/google/dedede/variants/magolor/overridetree.cb
4 files changed, 38 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/85/60185/3