ASoC: wsa884x: Constify struct regmap_config

`wsa884x_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-v1-9-2e379b0446a7@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/wsa884x.c

@@ -1319,7 +1319,7 @@ static bool wsa884x_volatile_register(struct device *dev, unsigned int reg)
 	return wsa884x_readonly_register(dev, reg);
 }
 
-static struct regmap_config wsa884x_regmap_config = {
+static const struct regmap_config wsa884x_regmap_config = {
 	.reg_bits = 32,
 	.val_bits = 8,
 	.cache_type = REGCACHE_MAPLE,