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/es1968.c

@@ -2656,7 +2656,7 @@ static int snd_es1968_create(struct snd_card *card,
 			     int radio_nr,
 			     struct es1968 **chip_ret)
 {
-	static struct snd_device_ops ops = {
+	static const struct snd_device_ops ops = {
 		.dev_free =	snd_es1968_dev_free,
 	};
 	struct es1968 *chip;