util/kconfig: Import some more of Linux's build infra

cmd and cmd_conf_cfg are necessary for `make menuconfig`
and `make nconfig`.

Change-Id: Ie16ef31a8e0137f3fd4129fb73ca6ef4669173cc
Signed-off-by: Patrick Georgi <patrick@georgi.software>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79264
Reviewed-by: Mike Banon <mikebdp2@gmail.com>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <gaumless@gmail.com>

0 files changed, 0 insertions, 0 deletions