ARM: dts: rockchip: correct regulator PM properties

This DTS file was submitted with non-upstream bindings. I happened
across this while reviewing the jaq DTS.

Signed-off-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>