[ALSA] emu10k1x - Add missing snd_card_set_dev call

Added the missing snd_card_set_dev() call.  This will fix the incomplete
sysfs entry for this card.

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