[L] Change in coreboot[main]: mb/lenovo: Add ThinkCentre M920q (Coffee Lake)

[Angel Pons (Code Review)]

Attention is currently required from: Alexander Couzens, Felix Singer, Maciej Pijanowski, Michał Kopeć, Paul Menzel.

Angel Pons has posted comments on this change by Maciej Pijanowski. ( https://review.coreboot.org/c/coreboot/+/80609?usp=email )

Change subject: mb/lenovo: Add ThinkCentre M920q (Coffee Lake)
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Patch Set 13: Code-Review+1

(4 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/80609/comment/e76786c6_70958358?usp... :
PS10, Line 26: - PCIe x8 port
> Thanks for this testing effort. Added some note on this in documentation.

Looks good

File Documentation/mainboard/lenovo/m920q.md:

https://review.coreboot.org/c/coreboot/+/80609/comment/0dc6d083_b464a0c6?usp... :
PS10, Line 85: - PCIe x8 port
> This port works, but see comments about riser problems.

Done

File src/mainboard/lenovo/m920q/gpio.c:

PS13: 
To address Felix's comments, I would just remove all occurrences of `\t/* GPIO */`. Yes, it would remove a few more comments, but they're not that useful anyway (one can see something is used as a GPIO from the pad macro)

File src/mainboard/lenovo/m920q/hda_verb.c:

https://review.coreboot.org/c/coreboot/+/80609/comment/ca02c410_a8de2d14?usp... :
PS10, Line 12: 0x411111f0
>

FWIW, these changes are as per CB:82394 and should be reproducible.