ASoC: dt-bindings: max98396: add voltage supplies

The device is supplied with 3 core voltages (DVVDIO, DVDD, AVDD), and
PVDD and/or VBAT.

Signed-off-by: Daniel Mack <daniel@zonque.org>
Link: https://lore.kernel.org/r/20220624104712.1934484-2-daniel@zonque.org


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