Change in coreboot[master]: mb/google/guybrush/var/nipperkin: Board values for eDP tuning

[Bao Zheng (Code Review)]

Attention is currently required from: Paul Menzel, Zheng Bao.
Bao Zheng has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/59919 )

Change subject: mb/google/guybrush/var/nipperkin: Board values for eDP tuning
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Patch Set 6:

(4 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/59919/comment/e57ea5f8_78d3905b 
PS5, Line 7: Google/Nipperkin
> mb/google/guybrush/var/nipperkin

Done

https://review.coreboot.org/c/coreboot/+/59919/comment/f6a06c60_296edaac 
PS5, Line 9: These values are got from experiment.
> How exactly?

Done

https://review.coreboot.org/c/coreboot/+/59919/comment/f2c6b3b7_87c41646 
PS5, Line 9: document
> That means the testing document? (Not the datasheet. […]

Done

File src/mainboard/google/guybrush/variants/nipperkin/overridetree.cb:

https://review.coreboot.org/c/coreboot/+/59919/comment/2f08af0e_544c6cb3 
PS5, Line 102: 0x1F
> In coreboot it’s common to write it lowercase.

Done