ASoC: max98088: Add headphone mixer switch

Add enable/disable headphone output mixers knob.

Signed-off-by: Marek Vasut <marex@denx.de>
Link: https://patch.msgid.link/20241111165523.113142-1-marex@denx.de
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Marek Vasut

sound/soc/codecs/max98088.c

@@ -489,6 +489,9 @@ static const struct snd_kcontrol_new max98088_snd_controls[] = {
        SOC_SINGLE("ADCL Boost Volume", M98088_REG_33_LVL_ADC_L, 4, 3, 0),
        SOC_SINGLE("ADCR Boost Volume", M98088_REG_34_LVL_ADC_R, 4, 3, 0),
 
+       SOC_SINGLE("Left HP Output Mixer Switch", M98088_REG_27_MIX_HP_CNTL, 4, 1, 0),
+       SOC_SINGLE("Right HP Output Mixer Switch", M98088_REG_27_MIX_HP_CNTL, 5, 1, 0),
+
        SOC_SINGLE("EQ1 Switch", M98088_REG_49_CFG_LEVEL, 0, 1, 0),
        SOC_SINGLE("EQ2 Switch", M98088_REG_49_CFG_LEVEL, 1, 1, 0),