arm64: dts: rockchip: Add cpu regulators and vcc5v0_sys to Khadas Edge 2

This commit adds 5V fixed power regulator and CPU regulators to Khadas
Edge 2.

Signed-off-by: Muhammed Efe Cetin <efectn@protonmail.com>
Link: https://lore.kernel.org/r/5a7bd2cd8703e51382abfc11242de59d45286477.1708381247.git.efectn@protonmail.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>