ASoC: cs35l35: Constify struct regmap_config

`cs35l35_regmap` is not modified and can be declared as const to move
its data to a read-only section.
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://patch.msgid.link/20240703-sound-const-regmap_config-v1-2-2e379b0446a7@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/cs35l35.c

@@ -1086,7 +1086,7 @@ static const struct snd_soc_component_driver soc_component_dev_cs35l35 = {
 	.endianness		= 1,
 };
 
-static struct regmap_config cs35l35_regmap = {
+static const struct regmap_config cs35l35_regmap = {
 	.reg_bits = 8,
 	.val_bits = 8,