ASoC: WM8985: Use the correct macro for the kcontrol defined

Since we are using custom get/put handlers
use SOC_ENUM_SINGLE_EXT_DECL instead of the original SOC_ENUM_SINGLE_DECL
macro.
Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/wm8985.c

@@ -185,8 +185,8 @@ static const SOC_ENUM_SINGLE_DECL(filter_mode, WM8985_ADC_CONTROL, 7,
 
 static const char *eq_bw_text[] = { "Narrow", "Wide" };
 static const char *eqmode_text[] = { "Capture", "Playback" };
-static const SOC_ENUM_SINGLE_DECL(eqmode, WM8985_EQ1_LOW_SHELF, 8,
-				  eqmode_text);
+static const SOC_ENUM_SINGLE_EXT_DECL(eqmode, eqmode_text);
+
 static const char *eq1_cutoff_text[] = {
 	"80Hz", "105Hz", "135Hz", "175Hz"
 };