ath79: mikrotik: fix network setup for lhg-hb platform

This network setup for MikroTik devices based on the LHG-HB platform
avoids using the integrated switch and connects the single Ethernet
port directly. This way, link speed (10/100 Mbps) is properly repor-
ted by eth0.

Fixes: FS#3309

Signed-off-by: Roger Pueyo Centelles <roger.pueyo@guifi.net>

target/linux/ath79/dts/qca9533_mikrotik_routerboard-lhg-hb.dtsi

@@ -67,12 +67,21 @@
 	};
 };
 
-&eth1 {
+&eth0 {
+	status = "okay";
+
+	phy-handle = <&swphy0>;
+
 	gmac-config {
 		device = <&gmac>;
+		switch-phy-swap = <1>;
 	};
 };
 
+&eth1 {
+	compatible = "syscon", "simple-mfd";
+};
+
 &pinmux {
 	led_wan_pin: pinmux_led_wan_pin {
 		pinctrl-single,bits = <0x4 0x0 0xff>;