regulator: Add regulators driver for Marvell 88PM886 PMIC

Support the LDO and buck regulators of the Marvell 88PM886 PMIC.

Signed-off-by: Karel Balej <balejk@matfyz.cz>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20240531175109.15599-4-balejk@matfyz.cz


Signed-off-by: Lee Jones <lee@kernel.org>