[ALSA] Reduce the string length of Terratec Aureon 7.1 Universe

Fix the driver string name for Terratec Aureon 7.1 Universe
to fit in 15 letters to avoid the overflow.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>