ALSA: ice1712: 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/20191210063454.31603-23-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/ice1712/ice1712.c

@@ -2528,7 +2528,6 @@ static int snd_ice1712_create(struct snd_card *card,
 	pci_write_config_word(ice->pci, 0x40, 0x807f);
 	pci_write_config_word(ice->pci, 0x42, 0x0006);
 	snd_ice1712_proc_init(ice);
-	synchronize_irq(pci->irq);
 
 	card->private_data = ice;
 
@@ -2551,6 +2550,7 @@ static int snd_ice1712_create(struct snd_card *card,
 	}
 
 	ice->irq = pci->irq;
+	card->sync_irq = ice->irq;
 
 	if (snd_ice1712_read_eeprom(ice, modelname) < 0) {
 		snd_ice1712_free(ice);