ASoC: sgtl5000: Use SOC_ENUM_SINGLE_DECL()

Just replace with the helper macro.  No functional change at all.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/codecs/sgtl5000.c

@@ -187,8 +187,9 @@ static const char *adc_mux_text[] = {
 	"MIC_IN", "LINE_IN"
 };
 
-static const struct soc_enum adc_enum =
-SOC_ENUM_SINGLE(SGTL5000_CHIP_ANA_CTRL, 2, 2, adc_mux_text);
+static SOC_ENUM_SINGLE_DECL(adc_enum,
+			    SGTL5000_CHIP_ANA_CTRL, 2,
+			    adc_mux_text);
 
 static const struct snd_kcontrol_new adc_mux =
 SOC_DAPM_ENUM("Capture Mux", adc_enum);
@@ -198,8 +199,9 @@ static const char *dac_mux_text[] = {
 	"DAC", "LINE_IN"
 };
 
-static const struct soc_enum dac_enum =
-SOC_ENUM_SINGLE(SGTL5000_CHIP_ANA_CTRL, 6, 2, dac_mux_text);
+static SOC_ENUM_SINGLE_DECL(dac_enum,
+			    SGTL5000_CHIP_ANA_CTRL, 6,
+			    dac_mux_text);
 
 static const struct snd_kcontrol_new dac_mux =
 SOC_DAPM_ENUM("Headphone Mux", dac_enum);