ARM: mvebu: Enable the network controller in Armada 375 DB board

This commit enables the network controller in the Armada 375 DB board,
and configures the two available ethernet interfaces.

Signed-off-by: Ezequiel Garcia <[e-mail]>
Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Jason Cooper <[e-mail]>

arch/arm/boot/dts/armada-375-db.dts

···
 				cd-gpios = <&gpio1 12 GPIO_ACTIVE_HIGH>;
 				wp-gpios = <&gpio1 13 GPIO_ACTIVE_HIGH>;
 			};
+
+			mdio {
+				phy0: ethernet-phy@0 {
+					reg = <0>;
+				};
+
+				phy3: ethernet-phy@3 {
+					reg = <3>;
+				};
+			};
+
+			ethernet@f0000 {
+				status = "okay";
+
+				eth0@c4000 {
+					status = "okay";
+					phy = <&phy0>;
+					phy-mode = "rgmii-id";
+				};
+
+				eth1@c5000 {
+					status = "okay";
+					phy = <&phy3>;
+					phy-mode = "gmii";
+				};
+			};
 		};
 
 		pcie-controller {