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/wm2200.c b/sound/soc/codecs/wm2200.c
index c830832..01aeb75 100644
--- a/sound/soc/codecs/wm2200.c
+++ b/sound/soc/codecs/wm2200.c
@@ -166,7 +166,7 @@
 	{ .type = WMFW_ADSP1_ZM, .base = WM2200_DSP2_ZM_BASE },
 };
 
-static struct reg_default wm2200_reg_defaults[] = {
+static const struct reg_default wm2200_reg_defaults[] = {
 	{ 0x000B, 0x0000 },   /* R11    - Tone Generator 1 */
 	{ 0x0102, 0x0000 },   /* R258   - Clocking 3 */
 	{ 0x0103, 0x0011 },   /* R259   - Clocking 4 */