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

arch/arm64/boot/dts/rockchip/rk356x.dtsi

@@ -203,6 +203,11 @@ gic: interrupt-controller@fd400000 {
 	pmugrf: syscon@fdc20000 {
 		compatible = "rockchip,rk3568-pmugrf", "syscon", "simple-mfd";
 		reg = <0x0 0xfdc20000 0x0 0x10000>;
+
+		pmu_io_domains: io-domains {
+			compatible = "rockchip,rk3568-pmu-io-voltage-domain";
+			status = "disabled";
+		};
 	};
 
 	grf: syscon@fdc60000 {