use-case.h: add SND_USE_CASE_DEV_DIRECT define
use-case.h: add SND_USE_CASE_DEV_DIRECT define

It may be useful to define the devices without channel remapping
(e.g. ProAudio devices).

Signed-off-by: Jaroslav Kysela <72edd5e1a572f82f059ccbb83c92b74d6cb051ff@perex.cz>

alsa-project/alsa-lib,alsa-project/alsa-lib,alsa-project/alsa-lib,alsa-project/alsa-lib