ASoC: dt-bindings: rt5682: Add AVDD, MICVDD and VBAT supplies

The rt5682 codec has three supplies - AVDD, MICVDD and VBAT - which are
already used by sc7180-trogdor.dtsi. Document them in the binding.

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Link: https://lore.kernel.org/r/20221102182002.255282-4-nfraprado@collabora.com


Signed-off-by: Mark Brown <broonie@kernel.org>