CircleCI Coreboot 4.11 based boards removal

[tlaurion]

Coreboot 4.11 based boards are causing a lot of race conditions under CircleCI since a long while.

I think now is the time to remove them.

KGPE-D16 board will reappear when stable (See Dasharo for that).

Originally posted by @tlaurion in #1178 (comment)

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Extract and accessible log trace under #1106 (comment)