dt-bindings: soc: mediatek: pwrap: Add power-domains property

dt-bindings: soc: mediatek: pwrap: Add power-domains property

Currently, the DT bindings for Mediatek PMIC Wrapper is missing the
power-domains property, which is used in the MT8173 E1 evaluation board as
it needs USB power domain.

Signed-off-by: Ariel D'Alessandro <ariel.dalessandro@collabora.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>