Add support for driconf overrides on a per-device level, for cases where we don't want to override behavior for all devices supported by a particular driver. Signed-off-by: Rob Clark <robdclark@chromium.org> Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12135>