ASoC: ad193x: Drop .volatile_reg implementation

adau193x_reg_volatile() always return false.
This seems pointless because current code uses REGCACHE_NONE cache_type
which is supposed to be volatile.

Signed-off-by: Axel Lin <[e-mail]>
Acked-by: Lars-Peter Clausen <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

sound/soc/codecs/ad193x.c

···
 	.num_dapm_routes = ARRAY_SIZE(audio_paths),
 };
 
-static bool adau193x_reg_volatile(struct device *dev, unsigned int reg)
-{
-	return false;
-}
-
 const struct regmap_config ad193x_regmap_config = {
 	.max_register = AD193X_NUM_REGS - 1,
-	.volatile_reg = adau193x_reg_volatile,
 };
 EXPORT_SYMBOL_GPL(ad193x_regmap_config);