ASoC: wsa881x: Constify struct regmap_config

`wsa881x_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-v1-7-2e379b0446a7@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/wsa881x.c

@@ -634,7 +634,7 @@ static bool wsa881x_volatile_register(struct device *dev, unsigned int reg)
 	}
 }
 
-static struct regmap_config wsa881x_regmap_config = {
+static const struct regmap_config wsa881x_regmap_config = {
 	.reg_bits = 32,
 	.val_bits = 8,
 	.cache_type = REGCACHE_MAPLE,