[L] Change in coreboot[main]: mb/dell: Add OptiPlex 7020/9020 port

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Attention is currently required from: Leah Rowe, Máté Kukri.

Name of user not set #1005484 has posted comments on this change by Máté Kukri. ( https://review.coreboot.org/c/coreboot/+/55232?usp=email )

Change subject: mb/dell: Add OptiPlex 7020/9020 port
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Patch Set 35:

(1 comment)

Patchset:

PS35: 
I have compiled and flashed this patch (patchset 31) through Libreboot on for my Dell 9020 SFF containing a Xeon E3-1246 v3 processor. Both the GRUB and SeaBIOS versions of both the Framebuffer and text variants DO boot into the OS (Pure OS for me), but during the boot, nothing is shown on screen and the monitor is NOT synced.

I guess this is not Libreboot specific but Xeon v3, as it has also been noted by someone who compiled Coreboot + EDK2 directly form source: https://www.reddit.com/r/coreboot/comments/137tbxy/comment/jjl1e14/