[coreboot-gerrit] Change in coreboot[master]: mb/hp/z220_series: Convert z220_sff_workstation into variant

[Angel Pons (Code Review)]

Attention is currently required from: Felix Singer, Damien Zammit, Edward O'Callaghan.
Angel Pons has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/62808 )

Change subject: mb/hp/z220_series: Convert z220_sff_workstation into variant
......................................................................

Patch Set 3:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/62808/comment/5ce09b92_e5d99bbc 
PS3, Line 17: Flashed bios region internally, mainboard also has FDO
            : (flash descriptor override) jumper that allows r/w to whole flash.
> For another commit: This is something worth adding to the documentation.

Ah, CB:63318 already exists.