[coreboot] Removal of mainboard Intel/Strago

[Nico Huber]

Hi all,

I just noticed that there is a seemingly abandoned board that creates
a lot of maintenance burden for coreboot, also because it's using FSP
UPDs that are not present in the upstream header files.

Does anybody still care about Intel/Strago? If not, I'd prefer to drop
it immediately. It's only a reference board, so likely never had many
users.

If somebody at Intel still cares about coreboot support for this board,
please have a look at this issue [1].

Nico

[1] https://github.com/IntelFsp/FSP/issues/14