'drm_dp_helper.h' file is duplicated and not used. Change-Id: Ibb08f7ff91c3914940dfe899be331b06e292c7c9 Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr> Reviewed-on: https://review.coreboot.org/c/coreboot/+/44842 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Nico Huber <nico.h@gmx.de>