rockchip: dts: rk3328-rock64: enable usb3 xhci controller

Rock64 has a USB3.0 port, enable the controller so that we can use it.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/dts/rk3328-rock64-u-boot.dtsi b/arch/arm/dts/rk3328-rock64-u-boot.dtsi
index dbcce6a..21c2afc 100644
--- a/arch/arm/dts/rk3328-rock64-u-boot.dtsi
+++ b/arch/arm/dts/rk3328-rock64-u-boot.dtsi
@@ -32,3 +32,7 @@
 &sdmmc {
 	u-boot,dm-pre-reloc;
 };
+
+&usb_host0_xhci {
+	status = "okay";
+};