nb/intel/x4x: Fix booting with FSB800 DDR667 combination

A small typo in the dll setting code prevented this combination from
booting.

TESTED on ga-g41m-es2l with 800MHz FSB CPU and 667MHz ddr2

Change-Id: Ib013471773c20336ba0902b7f328bfb6ef970747
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/20981
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
1 file changed