ALSA: emu10k1: Constify snd_emu_chip_details

The snd_emu_chip_details definitions are referred as read-only, hence
they can be declared as const gracefully.

There should be no functional changes by this patch.

Link: https://lore.kernel.org/r/20200103081714.9560-55-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/emu10k1/emu10k1_main.c

@@ -1283,7 +1283,7 @@ static int snd_emu10k1_dev_free(struct snd_device *device)
 	return snd_emu10k1_free(emu);
 }
 
-static struct snd_emu_chip_details emu_chip_details[] = {
+static const struct snd_emu_chip_details emu_chip_details[] = {
 	/* Audigy 5/Rx SB1550 */
 	/* Tested by michael@gernoth.net 28 Mar 2015 */
 	/* DSP: CA10300-IAT LF