regulator: Add MAX20086-MAX20089 driver

The MAX20086-MAX20089 are dual/quad power protectors for cameras. Add a
driver that supports controlling the outputs individually. Additional
features, such as overcurrent detection, may be added later if needed.

Signed-off-by: Watson Chow <watson.chow@avnet.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/20220106224350.16957-3-laurent.pinchart+renesas@ideasonboard.com


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