[coreboot] Kconfig: convert dependency lists into HAVE_x properties

[Jens Rottmann]

> I usually only post to the mailing list ("Reply to List"). I explicitely
> added you this time.

Thanks. :-) No problem at all, I can read all mails in the mailing list
archives. I only wanted to check if something's wrong with our server.

Cheers
Jens