ASoC: Constify reg_default tables

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Peter Rosin <peda@axentia.se>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/sound/soc/codecs/wm8993.c b/sound/soc/codecs/wm8993.c
index 8a8db86..f2d5211 100644
--- a/sound/soc/codecs/wm8993.c
+++ b/sound/soc/codecs/wm8993.c
@@ -41,7 +41,7 @@
 	"SPKVDD",
 };
 
-static struct reg_default wm8993_reg_defaults[] = {
+static const struct reg_default wm8993_reg_defaults[] = {
 	{ 1,   0x0000 },     /* R1   - Power Management (1) */
 	{ 2,   0x6000 },     /* R2   - Power Management (2) */
 	{ 3,   0x0000 },     /* R3   - Power Management (3) */
@@ -1595,7 +1595,7 @@
 #endif
 
 /* Tune DC servo configuration */
-static struct reg_default wm8993_regmap_patch[] = {
+static const struct reg_default wm8993_regmap_patch[] = {
 	{ 0x44, 3 },
 	{ 0x56, 3 },
 	{ 0x44, 0 },