dt-bindings: regulator: twl-regulator: convert to yaml

Convert the regulator bindings to yaml.

Drop one twl5030 compatible due to no documentation on mfd side and no
users of the twl5030.

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://msgid.link/r/20240606111611.371463-1-andreas@kemnade.info


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