ALSA: cs46xx: More constifications

Apply const prefix to each possible place: the static tables for
registers and op codes, etc.

Just for minor optimization and no functional changes.

Link: https://lore.kernel.org/r/20200105144823.29547-30-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/cs46xx/cs46xx_lib.c

@@ -3745,7 +3745,7 @@ static struct cs_card_type cards[] = {
  * APM support
  */
 #ifdef CONFIG_PM_SLEEP
-static unsigned int saved_regs[] = {
+static const unsigned int saved_regs[] = {
 	BA0_ACOSV,
 	/*BA0_ASER_FADDR,*/
 	BA0_ASER_MASTER,