Add a warning as suggested in patch CB:28233 with the "CONFIG_INTEL_DESCRIPTOR_MODE_REQUIRED" option. Change-Id: I42b6b336bb519f3d18b5a41eb20b380636ff5819 Signed-off-by: Angel Pons <th3fanbus@gmail.com> Reviewed-on: https://review.coreboot.org/28382 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Nico Huber <nico.h@gmx.de>