ASoC: wm8400: Use supplies to manage input power
ASoC: wm8400: Use supplies to manage input power

Rather than using a fake register to manage input power create some supply
widgets and use those.

Signed-off-by: Mark Brown <b51b9a92386687a9ac927cebfa0f978adeb8cea5@linaro.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs