tests/audio: Select the PCM device by name.

Allow to pass the PCM device to aplay and arecord. This adds the
'-D<device>' to these programs.

Signed-off-by: Enric Balletbo i Serra <eballetbo@iseebcn.com>
helpers/omap: Set amixer settings to playback/capture via headset for IGEP0050

Function that configures the amixer settings to playback/capture via the
headset. On IGEP0050 the default setting only route the audio via the HDMI
connector.

Signed-off-by: Enric Balletbo i Serra <eballetbo@iseebcn.com>
suites/board_igep0050: Add test for audio JACK.

Test audio JACK via loopback, the sound sent to audio-out should return in
audio-in.

Signed-off-by: Enric Balletbo i Serra <eballetbo@iseebcn.com>