ASoC: Convert WM8962 MICBIAS to a supply widget

A supply widget is generally clearer than a MICBIAS widget and a mic bias
is just a type of supply so use a supply widget for the MICBIAS. This also
avoids confusion with the routing when connected to multiple inputs.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2 files changed