arm64: dts: rockchip: fix property for usb2 phy supply on rock-3a

The property "vbus-supply" was copied from the vendor kernel but is not
available in mainstream. Use correct property "phy-supply".

Fixes: 254a1f6a ("arm64: dts: rockchip: add usb3 support to the radxa rock3 model a")
Signed-off-by: Michael Riesch <michael.riesch@wolfvision.net>
Link: https://lore.kernel.org/r/20220905064335.104650-1-michael.riesch@wolfvision.netSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts

@@ -581,7 +581,7 @@ &usb2phy0_host {
 };
 
 &usb2phy0_otg {
-	vbus-supply = <&vcc5v0_usb_otg>;
+	phy-supply = <&vcc5v0_usb_otg>;
 	status = "okay";
 };