arm64: dts: renesas: salvator-common: add companion property in usb3_peri0

This patch adds a property "companion" with xhci0 phandle to
the usb3_peri0 node in salvator-common.dtsi.

About the detail of this property for renesas_usb3 udc driver, please
refer to the commit 39facfa0 ("usb: gadget: udc: renesas_usb3:
Add register of usb role switch").
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/salvator-common.dtsi

@@ -817,6 +817,8 @@ &usb3_peri0 {
 	phys = <&usb3_phy0>;
 	phy-names = "usb";
 
+	companion = <&xhci0>;
+
 	status = "okay";
 };