ASoC: adau7118: Mark the ADAU7118 reset register as volatile

Without this the previously written value was written to this reg,
which caused the different configuration registers to be reset.

Signed-off-by: Chris Garren <cdgarren@indesign-llc.com>
Link: https://lore.kernel.org/r/1588599820-57994-1-git-send-email-cdgarren@indesign-llc.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/adau7118-i2c.c

@@ -32,6 +32,12 @@ static const struct reg_default adau7118_reg_defaults[] = {
 	{ ADAU7118_REG_RESET, 0x00 },
 };
 
+static bool adau7118_volatile(struct device *dev, unsigned int reg)
+{
+	return (reg == ADAU7118_REG_RESET);
+}
+
+
 static const struct regmap_config adau7118_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
@@ -39,6 +45,7 @@ static const struct regmap_config adau7118_regmap_config = {
 	.num_reg_defaults = ARRAY_SIZE(adau7118_reg_defaults),
 	.cache_type = REGCACHE_RBTREE,
 	.max_register = ADAU7118_REG_RESET,
+	.volatile_reg = adau7118_volatile,
 };
 
 static int adau7118_probe_i2c(struct i2c_client *i2c,