In 2007 Adrian Reber suggested that we drop ASSEMBLY in favor of __ASSEMBLER__.

http://www.coreboot.org/pipermail/coreboot/2007-September/024665.html

It's about time we follow this advice.

Also move some manually set __PRE_RAM__ defines (ap_romstage.c) to the Makefile and
drop unused CPP define

Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Acked-by: Patrick Georgi <patrick@georgi-clan.de>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6482 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1