ASoC: dmaengine: Add missing module description

Now that make W=1 starts complaining the lack of MODULE_DESCRIPTION(),
let's add the missing information.

Suggested-by: Andy Shevchenko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Takashi Iwai <[email protected]>
Reviewed-by: Dragan Simic <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

Author: tiwai

sound/soc/soc-generic-dmaengine-pcm.c

@@ -494,4 +494,5 @@ void snd_dmaengine_pcm_unregister(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_unregister);
 
+MODULE_DESCRIPTION("ASoC helpers for generic PCM dmaengine API");
 MODULE_LICENSE("GPL");