ALSA: es1968: More constifications

Apply const prefix to the quirk white/black lists.

Just for minor optimization and no functional changes.

Link: https://lore.kernel.org/r/20200105144823.29547-36-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/es1968.c

@@ -2631,7 +2631,7 @@ struct ess_device_list {
 	unsigned short vendor;	/* subsystem vendor id */
 };
 
-static struct ess_device_list pm_whitelist[] = {
+static const struct ess_device_list pm_whitelist[] = {
 	{ TYPE_MAESTRO2E, 0x0e11 },	/* Compaq Armada */
 	{ TYPE_MAESTRO2E, 0x1028 },
 	{ TYPE_MAESTRO2E, 0x103c },
@@ -2642,7 +2642,7 @@ static struct ess_device_list pm_whitelist[] = {
 	{ TYPE_MAESTRO2, 0x125d },	/* a PCI card, e.g. SF64-PCE2 */
 };
 
-static struct ess_device_list mpu_blacklist[] = {
+static const struct ess_device_list mpu_blacklist[] = {
 	{ TYPE_MAESTRO2, 0x125d },
 };