regulator: dt-bindings: Add regulator-power-budget-milliwatt property

Introduce a new property to describe the power budget of the regulator.
This property will allow power management support for regulator consumers
like PSE controllers, enabling them to make decisions based on the
available power capacity.

Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
Link: https://patch.msgid.link/20250115-feature_regulator_pw_budget-v2-2-0a44b949e6bc@bootlin.com


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