ASoC: dt-bindings: max98390: add reset gpio bindings

This adds support for the reset gpio binding.

Signed-off-by: Steve Lee <steve.lee.analog@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220420044900.2989-2-steve.lee.analog@gmail.com


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