[media] em28xx-audio: Some Alsa API fixes
Mark the alsa stream with SNDRV_PCM_INFO_BATCH,
as the timing to get audio streams can vary.
Also, add SNDRV_PCM_TRIGGER for pause/release.
while here, fix the stop indicator, to be sure that audio
will be properly released at the stop events.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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