drop unneeded __ROMCC__ checks when the check for __PRE_RAM__ is more

drop unneeded __ROMCC__ checks when the check for __PRE_RAM__ is more
appropriate. Also, factor out post_code() for __PRE_RAM__ code and drop it from
some mainboards.

Signed-off-by: Stefan Reinauer <stepan@coresystems.de>
Acked-by: Stefan Reinauer <stepan@coresystems.de>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5307 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1