dt-bindings: regulators: Add bindings for Maxim MAX20086-MAX20089

The MAX20086-MAX20089 are dual/quad power protectors for cameras. Add
corresponding DT bindings.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/20220106224350.16957-2-laurent.pinchart+renesas@ideasonboard.com


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