move target directory to have the same name as the directory in the

move target directory to have the same name as the directory in the
mainboard/ path. Also add a Config.lb for abuild. It's required for the
three images variant as abuild doesnt detect this automatically.
Trivial patch - it does not even fix the build yet. Patches welcome.

Signed-off-by: Stefan Reinauer <stepan@coresystems.de>
Acked-by: Stefan Reinauer <stepan@coresystems.de>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2906 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1