As the fixed voltage for the LDO is outside the range of the adjustable voltage mode,
the constraints for this scenario are not suitable to represent both modes.
Therefore, A property is added to specify the fixed LDO VOUT.

Examples of fixed LDO VOUT and adjustable LDO VOUT is also added to this version.
Signed-off-by: Alina Yu <alina_yu@richtek.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://msgid.link/r/c6cb218f6338291525a29ed89a88a42c175127ad.1716870419.git.alina_yu@richtek.comSigned-off-by: Mark Brown <broonie@kernel.org>