nb/intel/gm45: Add romstage timestamps

Change-Id: I558e6c63caf95ec5279ec5a866b54fb199116469
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/19678
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Philippe Mathieu-Daudé <philippe.mathieu.daude@gmail.com>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
4 files changed