Help prevent additional files coming in to the tree with the old license header. Change-Id: Idbafc2d8c05f87075083293d27900304c53e13dc Signed-off-by: Martin Roth <martinroth@google.com> Reviewed-on: https://review.coreboot.org/12920 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>