northbridge/intel: Do not define include guard as 1

As `#ifndef` and not `#if` is used in the check for
include guards, setting it to 1 is not needed.

Change-Id: Iaa6c0f807b9e99ad3c9551abe4ab1627e5505d67
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/8103
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
Tested-by: build bot (Jenkins)
9 files changed