ALSA: pcmcia: 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/20200103081714.9560-15-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pcmcia/pdaudiocf/pdaudiocf.c

@@ -82,7 +82,7 @@ static int snd_pdacf_probe(struct pcmcia_device *link)
 	int i, err;
 	struct snd_pdacf *pdacf;
 	struct snd_card *card;
-	static struct snd_device_ops ops = {
+	static const struct snd_device_ops ops = {
 		.dev_free =	snd_pdacf_dev_free,
 	};
 

sound/pcmcia/vx/vxpocket.c

@@ -126,7 +126,7 @@ static int snd_vxpocket_new(struct snd_card *card, int ibl,
 {
 	struct vx_core *chip;
 	struct snd_vxpocket *vxp;
-	static struct snd_device_ops ops = {
+	static const struct snd_device_ops ops = {
 		.dev_free =	snd_vxpocket_dev_free,
 	};
 	int err;