ALSA: fm801: Constify snd_fm801_tea575x_gpios

The snd_fm801_tea575x_gpios table is referred as read-only, hence it
can be declared as const gracefully.

There should be no functional changes by this patch.

Link: https://lore.kernel.org/r/20200103081714.9560-57-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/fm801.c

@@ -724,7 +724,7 @@ struct snd_fm801_tea575x_gpio {
 	char *name;
 };
 
-static struct snd_fm801_tea575x_gpio snd_fm801_tea575x_gpios[] = {
+static const struct snd_fm801_tea575x_gpio snd_fm801_tea575x_gpios[] = {
 	{ .data = 1, .clk = 3, .wren = 2, .most = 0, .name = "SF256-PCS" },
 	{ .data = 1, .clk = 0, .wren = 2, .most = 3, .name = "SF256-PCP" },
 	{ .data = 2, .clk = 0, .wren = 1, .most = 3, .name = "SF64-PCR" },