Add missing license headers to some Geode LX related files.

Add missing license headers to some Geode LX related files.

The following original authors agreed to the license:

 - Ronald G. Minnich <rminnich@gmail.com>
 - Indrek Kruusa <indrek.kruusa@artecdesign.ee>
 - Stefan Reinauer <stepan@coresystems.de>
 - Andrei Birjukov <andrei.birjukov@artecdesign.ee>

Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>
Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2625 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1