Add the inteltool path to the include path to be able to avoid ugly
include hacks like `#include "../inteltool.h"`.
Change-Id: Id363fa20fe3b52248a224ca14b2626a8e3ce44a2
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39744
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>