ASoC: rt5670: Set RT5670_IRQ_CTRL1 non volatile

RT5670_IRQ_CTRL1(0xbd) is a non volatile register. And we need to
restore its value after suspend/resume.
Signed-off-by: Bard Liao <bardliao@realtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org

sound/soc/codecs/rt5670.c

@@ -223,7 +223,6 @@ static bool rt5670_volatile_register(struct device *dev, unsigned int reg)
 	case RT5670_ADC_EQ_CTRL1:
 	case RT5670_EQ_CTRL1:
 	case RT5670_ALC_CTRL_1:
-	case RT5670_IRQ_CTRL1:
 	case RT5670_IRQ_CTRL2:
 	case RT5670_INT_IRQ_ST:
 	case RT5670_IL_CMD: