ASoC: cs42l42: Mark OSC_SWITCH_STATUS register volatile

OSC_SWITCH_STATUS is a volatile register indicating the current state
of the clock switch logic.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20211015133619.4698-15-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/cs42l42.c

@@ -52,7 +52,6 @@ static const struct reg_default cs42l42_reg_defaults[] = {
 	{ CS42L42_RSENSE_CTL1,			0x40 },
 	{ CS42L42_RSENSE_CTL2,			0x00 },
 	{ CS42L42_OSC_SWITCH,			0x00 },
-	{ CS42L42_OSC_SWITCH_STATUS,		0x05 },
 	{ CS42L42_RSENSE_CTL3,			0x1B },
 	{ CS42L42_TSENSE_CTL,			0x1B },
 	{ CS42L42_TSRS_INT_DISABLE,		0x00 },
@@ -331,6 +330,7 @@ static bool cs42l42_volatile_register(struct device *dev, unsigned int reg)
 	case CS42L42_DEVID_CD:
 	case CS42L42_DEVID_E:
 	case CS42L42_MCLK_STATUS:
+	case CS42L42_OSC_SWITCH_STATUS:
 	case CS42L42_TRSENSE_STATUS:
 	case CS42L42_HS_DET_STATUS:
 	case CS42L42_ADC_OVFL_STATUS: