ASoC: sgtl5000: add headphone and LINEOUT mute controls

These controls mute/unmute the LINEOUT and headphone outputs of SGTL5000
using its CHIP_ANA_CTRL register.

Signed-off-by: Richard Leitner <dev@g0hl1n.net>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/sgtl5000.c

@@ -411,6 +411,8 @@ static const struct snd_kcontrol_new sgtl5000_snd_controls[] = {
 			0, 8,
 			0x7f, 1,
 			headphone_volume),
+	SOC_SINGLE("Headphone Playback Switch", SGTL5000_CHIP_ANA_CTRL,
+			4, 1, 1),
 	SOC_SINGLE("Headphone Playback ZC Switch", SGTL5000_CHIP_ANA_CTRL,
 			5, 1, 0),
 
@@ -423,6 +425,7 @@ static const struct snd_kcontrol_new sgtl5000_snd_controls[] = {
 			SGTL5000_LINE_OUT_VOL_RIGHT_SHIFT,
 			0x1f, 1,
 			lineout_volume),
+	SOC_SINGLE("Lineout Playback Switch", SGTL5000_CHIP_ANA_CTRL, 8, 1, 1),
 };
 
 /* mute the codec used by alsa core */