dts: mtmips: enable eth port0 led and link poll functions for all boards

This patch adds default p0led status and phy0 link polling for all boards.

Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
diff --git a/arch/mips/dts/gardena-smart-gateway-mt7688.dts b/arch/mips/dts/gardena-smart-gateway-mt7688.dts
index 95675a3..fc1f5e9 100644
--- a/arch/mips/dts/gardena-smart-gateway-mt7688.dts
+++ b/arch/mips/dts/gardena-smart-gateway-mt7688.dts
@@ -85,6 +85,15 @@
 	};
 };
 
+&pinctrl {
+	state_default: pin_state {
+		p0led {
+			groups = "p0led_a";
+			function = "led";
+		};
+	};
+};
+
 &uart0 {
 	status = "okay";
 };
@@ -109,3 +118,7 @@
 		reg = <1>;
 	};
 };
+
+&eth {
+	mediatek,poll-link-phy = <0>;
+};