arm64: dts: renesas: r8a774c0: Connect RZ/G2E AVB to IPMMU

Hook up the RZ/G2E AVB device to IPMMU-DS0 as stated by the
RZ/G2 User's manual.
Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/r8a774c0.dtsi

@@ -798,6 +798,7 @@ avb: ethernet@e6800000 {
 			power-domains = <&sysc R8A774C0_PD_ALWAYS_ON>;
 			resets = <&cpg 812>;
 			phy-mode = "rgmii";
+			iommus = <&ipmmu_ds0 16>;
 			#address-cells = <1>;
 			#size-cells = <0>;
 			status = "disabled";