ASoC: wm9713: Use virtual control instead of virtual register

The wm9713 currently implements the virtual control for the Mic B Source MUX
using a virtual register. Replace this by using SOC_ENUM_SINGLE_VIRT().

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/wm9713.c

@@ -59,13 +59,12 @@ static const u16 wm9713_reg[] = {
 	0x0000, 0x0000, 0x0000, 0x0000,
 	0x0000, 0x0000, 0x0000, 0x0006,
 	0x0001, 0x0000, 0x574d, 0x4c13,
-	0x0000, 0x0000, 0x0000
+	0x0000, 0x0000
 };
 
 /* virtual HP mixers regs */
 #define HPL_MIXER	0x80
 #define HPR_MIXER	0x82
-#define MICB_MUX	0x82
 
 static const char *wm9713_mic_mixer[] = {"Stereo", "Mic 1", "Mic 2", "Mute"};
 static const char *wm9713_rec_mux[] = {"Stereo", "Left", "Right", "Mute"};
@@ -110,7 +109,7 @@ SOC_ENUM_SINGLE(AC97_REC_GAIN_MIC, 10, 8, wm9713_dac_inv), /* dac invert 2 15 */
 SOC_ENUM_SINGLE(AC97_GENERAL_PURPOSE, 15, 2, wm9713_bass), /* bass control 16 */
 SOC_ENUM_SINGLE(AC97_PCI_SVID, 5, 2, wm9713_ng_type), /* noise gate type 17 */
 SOC_ENUM_SINGLE(AC97_3D_CONTROL, 12, 3, wm9713_mic_select), /* mic selection 18 */
-SOC_ENUM_SINGLE(MICB_MUX, 0, 2, wm9713_micb_select), /* mic selection 19 */
+SOC_ENUM_SINGLE_VIRT(2, wm9713_micb_select), /* mic selection 19 */
 };
 
 static const DECLARE_TLV_DB_SCALE(out_tlv, -4650, 150, 0);