ASoC: jz4770: Constify struct regmap_config

`jz4760_codec_regmap_config` 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-v1-6-2e379b0446a7@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/jz4770.c

@@ -872,7 +872,7 @@ static const u8 jz4770_codec_reg_defaults[] = {
 	0x07, 0x44, 0x1F, 0x00
 };
 
-static struct regmap_config jz4770_codec_regmap_config = {
+static const struct regmap_config jz4770_codec_regmap_config = {
 	.reg_bits = 7,
 	.val_bits = 8,