ASoC: cs42l73: Constify struct regmap_config and snd_soc_codec_driver

The regmap_config struct may be const because it is not modified by the
driver and regmap_init() accepts pointer to const. Make struct
snd_soc_codec_driver const as well (snd_soc_register_codec() accepts
pointer to const).

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Acked-by: Brian Austin <brian.austin@cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/cs42l73.c

@@ -1347,7 +1347,7 @@ static int cs42l73_probe(struct snd_soc_codec *codec)
 	return 0;
 }
 
-static struct snd_soc_codec_driver soc_codec_dev_cs42l73 = {
+static const struct snd_soc_codec_driver soc_codec_dev_cs42l73 = {
 	.probe = cs42l73_probe,
 	.set_bias_level = cs42l73_set_bias_level,
 	.suspend_bias_off = true,
@@ -1361,7 +1361,7 @@ static struct snd_soc_codec_driver soc_codec_dev_cs42l73 = {
 	.num_controls = ARRAY_SIZE(cs42l73_snd_controls),
 };
 
-static struct regmap_config cs42l73_regmap = {
+static const struct regmap_config cs42l73_regmap = {
 	.reg_bits = 8,
 	.val_bits = 8,