arm64: dts: rockchip: add core io domains node for rk356x

Enable the PMU IO domains for the RK3566 and the RK3568.

Signed-off-by: Michael Riesch <michael.riesch@wolfvision.net>
Link: https://lore.kernel.org/r/20210805120107.27007-4-michael.riesch@wolfvision.net


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