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/ml26124.c b/sound/soc/codecs/ml26124.c
index b74118e..1e8ede8 100644
--- a/sound/soc/codecs/ml26124.c
+++ b/sound/soc/codecs/ml26124.c
@@ -199,7 +199,7 @@
 	{12288000, 48000, 0xc, 0x0, 0x30, 0x0, 0x4},
 };
 
-static struct reg_default ml26124_reg[] = {
+static const struct reg_default ml26124_reg[] = {
 	/* CLOCK control Register */
 	{0x00, 0x00 },	/* Sampling Rate */
 	{0x02, 0x00},	/* PLL NL */