arm64: dts: rockchip: add GIC ITS support to rk3588

Add the two Interrupt Translation Service (ITS) IPs that are part of the
GIC-600. They are mainly required for PCIe Message Signalled Interrupts
(MSI).
Co-developed-by: Kever Yang <kever.yang@rock-chips.com>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20230418142109.49762-3-sebastian.reichel@collabora.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3588s.dtsi

@@ -1300,7 +1300,24 @@ gic: interrupt-controller@fe600000 {
 		mbi-alias = <0x0 0xfe610000>;
 		mbi-ranges = <424 56>;
 		msi-controller;
+		ranges;
+		#address-cells = <2>;
 		#interrupt-cells = <4>;
+		#size-cells = <2>;
+
+		its0: msi-controller@fe640000 {
+			compatible = "arm,gic-v3-its";
+			reg = <0x0 0xfe640000 0x0 0x20000>;
+			msi-controller;
+			#msi-cells = <1>;
+		};
+
+		its1: msi-controller@fe660000 {
+			compatible = "arm,gic-v3-its";
+			reg = <0x0 0xfe660000 0x0 0x20000>;
+			msi-controller;
+			#msi-cells = <1>;
+		};
 
 		ppi-partitions {
 			ppi_partition0: interrupt-partition-0 {