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

[Ren Kuo (Code Review)]

Attention is currently required from: Evan Green, Paul Menzel, Aseda Aboagye, Tyler Wang, Karthik Ramasubramanian.
Ren Kuo has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/60185 )

Change subject: mb/google/dedede/var/magolor: Add stylus pen function
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Patch Set 2: Code-Review+1

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/60185/comment/98587b27_81d598d7 
PS1, Line 9: Update devicetree and gpio to handle stylus pen detection.
> Please add the documents/source for the implementation. […]

Added the related schematics of pen detect signal:
https://partnerissuetracker.corp.google.com/issues/167983049#comment28