ASoC: tegra: add .stream_name to CPU DAIs

This is certainly required if the I2S and SPDIF controllers are converted
to be CODECs, and is probably good practice irrespective.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/tegra/tegra20_spdif.c b/sound/soc/tegra/tegra20_spdif.c
index f9b5741..ffbd99c 100644
--- a/sound/soc/tegra/tegra20_spdif.c
+++ b/sound/soc/tegra/tegra20_spdif.c
@@ -181,6 +181,7 @@
 	.name = DRV_NAME,
 	.probe = tegra20_spdif_probe,
 	.playback = {
+		.stream_name = "Playback",
 		.channels_min = 2,
 		.channels_max = 2,
 		.rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |