ASoC: sgtl5000: Convert mic bias to a supply widget

No current users and it's the last user of MICBIAS_E().
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Dong Aisheng <dong.aisheng@linaro.org>
Acked-by: Zeng Zhaoming <zengzm.kernel@gmail.com>
Tested-by: Shawn Guo <shawn.guo@linaro.org>

sound/soc/codecs/sgtl5000.c

@@ -197,9 +197,9 @@ static const struct snd_soc_dapm_widget sgtl5000_dapm_widgets[] = {
 	SND_SOC_DAPM_OUTPUT("HP_OUT"),
 	SND_SOC_DAPM_OUTPUT("LINE_OUT"),
 
-	SND_SOC_DAPM_MICBIAS_E("Mic Bias", SGTL5000_CHIP_MIC_CTRL, 8, 0,
-				mic_bias_event,
-				SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
+	SND_SOC_DAPM_SUPPLY("Mic Bias", SGTL5000_CHIP_MIC_CTRL, 8, 0,
+			    mic_bias_event,
+			    SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
 
 	SND_SOC_DAPM_PGA_E("HP", SGTL5000_CHIP_ANA_POWER, 4, 0, NULL, 0,
 			small_pop_event,