ASoC: max98373: Added speaker FS gain cotnrol register to volatile.

Signed-off-by: Ryan Lee <ryans.lee@maximintegrated.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/max98373.c

@@ -520,6 +520,7 @@ static bool max98373_volatile_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case MAX98373_R2000_SW_RESET ... MAX98373_R2009_INT_FLAG3:
+	case MAX98373_R203E_AMP_PATH_GAIN:
 	case MAX98373_R2054_MEAS_ADC_PVDD_CH_READBACK:
 	case MAX98373_R2055_MEAS_ADC_THERM_CH_READBACK:
 	case MAX98373_R20B6_BDE_CUR_STATE_READBACK: