arm64: dts: renesas: v3msk: add EtherAVB pins

Add the (previously omitted) EtherAVB pin data to the V3M Starter Kit
board's device tree.
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/r8a77970-v3msk.dts

@@ -32,6 +32,9 @@ memory@48000000 {
 };
 
 &avb {
+	pinctrl-0 = <&avb_pins>;
+	pinctrl-names = "default";
+
 	renesas,no-ether-link;
 	phy-handle = <&phy0>;
 	phy-mode = "rgmii-id";
@@ -52,6 +55,11 @@ &extalr_clk {
 };
 
 &pfc {
+	avb_pins: avb0 {
+		groups = "avb0_mdio", "avb0_rgmii", "avb0_txcrefclk";
+		function = "avb0";
+	};
+
 	scif0_pins: scif0 {
 		groups = "scif0_data";
 		function = "scif0";