ASoC: dapm: Remove SND_SOC_DAPM_MICBIAS_E()

There are no users any more and new drivers should be using supply widgets
which fully replace it anyway.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Zeng Zhaoming <zengzm.kernel@gmail.com>

include/sound/soc-dapm.h

@@ -141,10 +141,6 @@ struct device;
 {       .id = snd_soc_dapm_mixer, .name = wname, .reg = wreg, .shift = wshift, \
 	.invert = winvert, .kcontrol_news = wcontrols, \
 	.num_kcontrols = wncontrols, .event = wevent, .event_flags = wflags}
-#define SND_SOC_DAPM_MICBIAS_E(wname, wreg, wshift, winvert, wevent, wflags) \
-{	.id = snd_soc_dapm_micbias, .name = wname, .reg = wreg, .shift = wshift, \
-	.invert = winvert, .kcontrol_news = NULL, .num_kcontrols = 0, \
-	.event = wevent, .event_flags = wflags}
 #define SND_SOC_DAPM_SWITCH_E(wname, wreg, wshift, winvert, wcontrols, \
 	wevent, wflags) \
 {	.id = snd_soc_dapm_switch, .name = wname, .reg = wreg, .shift = wshift, \