ASoC: cs4349: Constify cs4349_regmap

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Tim Howe <tim.howe@cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/sound/soc/codecs/cs4349.c b/sound/soc/codecs/cs4349.c
index 9273b06..f4fccc6 100644
--- a/sound/soc/codecs/cs4349.c
+++ b/sound/soc/codecs/cs4349.c
@@ -264,7 +264,7 @@
 	.num_dapm_routes	= ARRAY_SIZE(cs4349_routes),
 };
 
-static struct regmap_config cs4349_regmap = {
+static const struct regmap_config cs4349_regmap = {
 	.reg_bits		= 8,
 	.val_bits		= 8,