ALSA: cmipci: Support PCM sync_stop

The driver invokes snd_pcm_period_elapsed() simply from the interrupt
handler.  Set card->sync_irq for enabling the missing sync_stop PCM
operation.

Link: https://lore.kernel.org/r/20191210063454.31603-11-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/cmipci.c

@@ -3024,6 +3024,7 @@ static int snd_cmipci_create(struct snd_card *card, struct pci_dev *pci,
 		return -EBUSY;
 	}
 	cm->irq = pci->irq;
+	card->sync_irq = cm->irq;
 
 	pci_set_master(cm->pci);