This test covers check for WCD and HDMI audio driver/devices and check
/proc/asound to ensure soundcard has devices attached.
Common assert_soundcard_present is implemented to check /proc/asound for
soundcards a devices associated with it. In this case 2 Playbacks and 1
Capture device.
Signed-off-by: Aníbal Limón <anibal.limon@linaro.org>
