ALSA: msnd: add module description and license for the snd-msnd-lib

The missing module license generates warning
during module loading.
Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/isa/msnd/msnd.c

@@ -700,3 +700,6 @@ int snd_msnd_pcm(struct snd_card *card, int device,
 }
 EXPORT_SYMBOL(snd_msnd_pcm);
 
+MODULE_DESCRIPTION("Common routines for Turtle Beach Multisound drivers");
+MODULE_LICENSE("GPL");
+