arm64: dts: rockchip: rk3588-rock5b: add USB3 host

Enable USB3 host controller for the Radxa ROCK 5 Model B. This adds
USB3 for the upper USB3 port (the one further away from the PCB).

The lower USB3 (closer to the PCB) and the USB-C ports use the RK3588
USB TypeC host controller, which use a different PHY that is not yet
supported upstream.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts

@@ -138,6 +138,10 @@
 	status = "okay";
 };
 
+&combphy2_psu {
+	status = "okay";
+};
+
 &cpu_b0 {
 	cpu-supply = <&vdd_cpu_big0_s0>;
 };
@@ -765,3 +769,7 @@
 &usb_host1_ohci {
 	status = "okay";
 };
+
+&usb_host2_xhci {
+	status = "okay";
+};