dt-bindings: regulators: convert non-smd RPM Regulators bindings to dt-schema

Convert the non-SMD Regulators bindings to dt-schema, the old text based
bindings will be deleted later since the RPM bindings are not yet converted.

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20221005-mdm9615-pinctrl-yaml-v6-1-6c913908bb85@linaro.org


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