ASoC: Constify of_phandle_args in snd_soc_dai_driver

ASoC core code does not modify contents of 'of_phandle_args' in 'struct
snd_soc_dai_driver', so the pointer can be made as a pointer to const.
This makes code safer, serves as clear annotation of core's intentions
and allows putting pointed structures in rodata (if ever applicable).
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://msgid.link/r/20240617-n-asoc-const-auto-selectable-formats-v1-1-8004f346ee38@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc-dai.h

@@ -413,7 +413,7 @@ struct snd_soc_dai_driver {
 	unsigned int id;
 	unsigned int base;
 	struct snd_soc_dobj dobj;
-	struct of_phandle_args *dai_args;
+	const struct of_phandle_args *dai_args;
 
 	/* ops */
 	const struct snd_soc_dai_ops *ops;