ARM: dts: r8a7790: Use R-Car Gen2 Ether fallback compat string

Use newly added R-Car Gen2 Ether fallback compat string
in the DT of the r8a7790 SoC.

This should have no run-time effect as the driver matches against
the per-SoC compat string before considering the fallback compat string.
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm/boot/dts/r8a7790.dtsi

@@ -906,7 +906,8 @@ smp-sram@0 {
 	};
 
 	ether: ethernet@ee700000 {
-		compatible = "renesas,ether-r8a7790";
+		compatible = "renesas,ether-r8a7790",
+			     "renesas,rcar-gen2-ether";
 		reg = <0 0xee700000 0 0x400>;
 		interrupts = <GIC_SPI 162 IRQ_TYPE_LEVEL_HIGH>;
 		clocks = <&cpg CPG_MOD 813>;