ALSA: pci: Constify snd_device_ops definitions

Now we may declare const for snd_device_ops definitions, so let's do
it for optimization.

There should be no functional changes by this patch.

Link: https://lore.kernel.org/r/20200103081714.9560-10-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/mixart/mixart.c

@@ -1030,7 +1030,7 @@ static int snd_mixart_create(struct mixart_mgr *mgr, struct snd_card *card, int
 {
 	int err;
 	struct snd_mixart *chip;
-	static struct snd_device_ops ops = {
+	static const struct snd_device_ops ops = {
 		.dev_free = snd_mixart_chip_dev_free,
 	};