drop three unneeded config variables:

drop three unneeded config variables:
- HAVE_HIGH_TABLES
- HAVE_LOW_TABLES
- FALLBACK_SIZE

Jens Rottmann sent an almost identical patch at the same time, so
Signed-off-by: Jens Rottmann <JRottmann@LiPPERTEmbedded.de>
Signed-off-by: Stefan Reinauer <stepan@coresystems.de>
Acked-by: Stefan Reinauer <stepan@coresystems.de>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5745 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1