regulator: Add bindings for MT6332 regulator

Add devicetree bindings for the regulators found in the MT6332 PMIC.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220913123456.384513-4-angelogioacchino.delregno@collabora.com


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