board: sl28: add DSA support for variant 2

Now that u-boot gained DSA support, and it is already enabled for the
kontron_sl28 board, add the last missing piece and enable the
corresponding devices it in the device tree.

Signed-off-by: Michael Walle <michael@walle.cc>
diff --git a/arch/arm/dts/fsl-ls1028a-kontron-sl28-var2.dts b/arch/arm/dts/fsl-ls1028a-kontron-sl28-var2.dts
index 1ea1265..7a3aa21 100644
--- a/arch/arm/dts/fsl-ls1028a-kontron-sl28-var2.dts
+++ b/arch/arm/dts/fsl-ls1028a-kontron-sl28-var2.dts
@@ -22,4 +22,44 @@
 	/delete-property/ phy-handle;
 };
 
+&enetc2 {
+	status = "okay";
+};
+
+&mscc_felix {
+	status = "okay";
+};
+
+&mscc_felix_port0 {
+	label = "gbe0";
+	phy-handle = <&phy0>;
+	phy-mode = "sgmii";
+	status = "okay";
+};
+
+&mscc_felix_port1 {
+	label = "gbe1";
+	phy-handle = <&phy1>;
+	phy-mode = "sgmii";
+	status = "okay";
+};
+
+&mscc_felix_port4 {
+	ethernet = <&enetc2>;
+	status = "okay";
+};
+
 /delete-node/ &phy0;
+&mdio0 {
+	phy0: ethernet-phy@5 {
+		reg = <0x5>;
+		eee-broken-1000t;
+		eee-broken-100tx;
+	};
+
+	phy1: ethernet-phy@4 {
+		reg = <0x4>;
+		eee-broken-1000t;
+		eee-broken-100tx;
+	};
+};