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.com


Signed-off-by: Mark Brown <broonie@kernel.org>