ALSA: ac97: legacy: Add missing module description

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

Reported-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Closes: https://lore.kernel.org/r/ZjpQm-hxLQtpgkUx@smile.fi.intel.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Dragan Simic <dsimic@manjaro.org>
Link: https://lore.kernel.org/r/20240508091128.25274-2-tiwai@suse.de

Author: tiwai

sound/ac97_bus.c

@@ -95,4 +95,5 @@ module_exit(ac97_bus_exit);
 
 EXPORT_SYMBOL(ac97_bus_type);
 
+MODULE_DESCRIPTION("Legacy AC97 bus interface");
 MODULE_LICENSE("GPL");