If not derived it's possible it defines
inconsistent timestamps which differ from each other.
Change-Id: I090fdce4c4c1c24135ec72818eecb69e168df565
Signed-off-by: Alexander Couzens <lynxis@fe80.eu>
Reviewed-on: http://review.coreboot.org/8617
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>