ARM: dts: rockchip: Add 12V main supply for edgeble-neu2

The Main supply volatge for Edgeble Neu2 IO board is 12V DC.

Add the 12v supply regulator for it and input to vcc5v0_sys.

Since the power regulator is part of IO board circuit, move the
regulator in IO dts file.

Signed-off-by: Jagan Teki <jagan@edgeble.ai>
Link: https://lore.kernel.org/r/20230731103518.2906147-14-jagan@edgeble.ai


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