ASoC: sigmadsp: 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/codecs/sigmadsp.c

@@ -805,4 +805,5 @@ int sigmadsp_restrict_params(struct sigmadsp *sigmadsp,
 }
 EXPORT_SYMBOL_GPL(sigmadsp_restrict_params);
 
+MODULE_DESCRIPTION("Analog Devices SigmaStudio firmware helpers");
 MODULE_LICENSE("GPL");