ALSA: cmi8330: 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 <arvind.yadav.cs@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/isa/cmi8330.c

@@ -182,7 +182,7 @@ struct snd_cmi8330 {
 
 #ifdef CONFIG_PNP
 
-static struct pnp_card_device_id snd_cmi8330_pnpids[] = {
+static const struct pnp_card_device_id snd_cmi8330_pnpids[] = {
 	{ .id = "CMI0001", .devs = { { "@X@0001" }, { "@@@0001" }, { "@H@0001" }, { "A@@0001" } } },
 	{ .id = "CMI0001", .devs = { { "@@@0001" }, { "@X@0001" }, { "@H@0001" } } },
 	{ .id = "" }