regulator: add MP5496 regulator compatible

IPQ6018 uses the PMIC MP5496. Add the binding for the same.

Signed-off-by: Kathiravan T <kathirav@codeaurora.org>
Link: https://lore.kernel.org/r/1592889472-6843-4-git-send-email-kathirav@codeaurora.org


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