ASoC: ad1836: 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/ad1836.c

@@ -40,8 +40,8 @@ struct ad1836_priv {
  */
 static const char *ad1836_deemp[] = {"None", "44.1kHz", "32kHz", "48kHz"};
 
-static const struct soc_enum ad1836_deemp_enum =
-	SOC_ENUM_SINGLE(AD1836_DAC_CTRL1, 8, 4, ad1836_deemp);
+static SOC_ENUM_SINGLE_DECL(ad1836_deemp_enum,
+			    AD1836_DAC_CTRL1, 8, ad1836_deemp);
 
 #define AD1836_DAC_VOLUME(x) \
 	SOC_DOUBLE_R("DAC" #x " Playback Volume", AD1836_DAC_L_VOL(x), \