ALSA: azt2320: constify pnp_card_device_id

pnp_card_device_id are not supposed to change at runtime. All functions
working with pnp_card_device_id provided by <linux/pnp.h> work with
const pnp_card_device_id. So mark the non-const structs as const.

Signed-off-by: Arvind Yadav <[e-mail]>
Signed-off-by: Takashi Iwai <[e-mail]>

sound/isa/azt2320.c

···
 	struct snd_wss *chip;
 };
 
-static struct pnp_card_device_id snd_azt2320_pnpids[] = {
+static const struct pnp_card_device_id snd_azt2320_pnpids[] = {
 	/* PRO16V */
 	{ .id = "AZT1008", .devs = { { "AZT1008" }, { "AZT2001" }, } },
 	/* Aztech Sound Galaxy 16 */