Fix race condition in option_table.h generation by moving the include statement

Fix race condition in option_table.h generation by moving the include statement
to those files that actually need it. This significantly reduces the number of
dependencies, so it's no longer extremely ugly to specify them manually (see
the src/pc80/Makefile.inc portion)
Also, drop the AMD DBM690T work around for the issue.

Signed-off-by: Stefan Reinauer <stepan@coresystems.de>
Acked-by: Myles Watson <mylesgw@gmail.com>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5762 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1