ASoC: Convert wm8974 MICBIAS to a supply widget

Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/wm8974.c

@@ -226,7 +226,7 @@ SND_SOC_DAPM_MIXER("Input PGA", WM8974_POWER2, 2, 0, wm8974_inpga,
 SND_SOC_DAPM_MIXER("Boost Mixer", WM8974_POWER2, 4, 0,
 		   wm8974_boost_mixer, ARRAY_SIZE(wm8974_boost_mixer)),
 
-SND_SOC_DAPM_MICBIAS("Mic Bias", WM8974_POWER1, 4, 0),
+SND_SOC_DAPM_SUPPLY("Mic Bias", WM8974_POWER1, 4, 0, NULL, 0),
 
 SND_SOC_DAPM_INPUT("MICN"),
 SND_SOC_DAPM_INPUT("MICP"),