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

[Angel Pons (Code Review)]

Attention is currently required from: Alexander Couzens, 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 10: Code-Review+2

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/80609/comment/8330c64d_6791687d?usp... :
PS10, Line 26: - PCIe x8 port
Tested by `dnssound.` on the coreboot Discord using a `BA7H70 Rev 1.2` riser and an Intel `X540-T2 10G` dual 10GbE card (PCIe x8).

What remains untested, however, is a different riser with a PCIe x4 connector. On that riser, the PCIe lanes come from the PCH for some reason.

File src/mainboard/lenovo/m920q/devicetree.cb:

https://review.coreboot.org/c/coreboot/+/80609/comment/04fbc778_3de0847f?usp... :
PS7, Line 15: 		device ref peg0 		on	end		# Slot JP3 - not tested
> Done

Update: The `BA7H70 Rev 1.2` riser works properly