ALSA: ice1724: 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, as well as removing the superfluous synchronize_irq()
call.

Link: https://lore.kernel.org/r/20191210063454.31603-24-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/ice1712/ice1724.c

@@ -2534,7 +2534,6 @@ static int snd_vt1724_create(struct snd_card *card,
 	ice->irq = -1;
 	pci_set_master(pci);
 	snd_vt1724_proc_init(ice);
-	synchronize_irq(pci->irq);
 
 	card->private_data = ice;
 
@@ -2555,6 +2554,7 @@ static int snd_vt1724_create(struct snd_card *card,
 	}
 
 	ice->irq = pci->irq;
+	card->sync_irq = ice->irq;
 
 	snd_vt1724_chip_reset(ice);
 	if (snd_vt1724_read_eeprom(ice, modelname) < 0) {