[][kernel][mt7986][eth][Refactor external PHY0 DTS configuratoin]

[Description]
Refactor external PHY0 DTS configuratoin.

Move phy-handle of external PHY0 to lan5(switch port5) to meet RFB topology.

[Release-log]
N/A

Change-Id: I5d2ce72159a5824335bb32499168e5eb5191a412
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6398255
diff --git a/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7986a-2500wan-sd-rfb.dts b/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7986a-2500wan-sd-rfb.dts
index 6de3edc..32f9320 100644
--- a/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7986a-2500wan-sd-rfb.dts
+++ b/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7986a-2500wan-sd-rfb.dts
@@ -59,7 +59,7 @@
 &uart2 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart2_pins>;
-	status = "disabled";
+	status = "okay";
 };
 
 &i2c0 {
@@ -93,9 +93,6 @@
 			speed = <2500>;
 			full-duplex;
 			pause;
-			link-gpio = <&pio 47 0>;
-			phy-handle = <&phy5>;
-			label = "lan5";
 		};
 	};
 
@@ -114,7 +111,7 @@
 		reset-delay-us = <600>;
 
 		phy5: phy@5 {
-			compatible = "ethernet-phy-id67c9.de0a";
+			compatible = "ethernet-phy-ieee802.3-c45";
 			reg = <5>;
 		};
 
@@ -161,12 +158,7 @@
 					reg = <5>;
 					label = "lan5";
 					phy-mode = "2500base-x";
-
-					fixed-link {
-						speed = <2500>;
-						full-duplex;
-						pause;
-					};
+					phy-handle = <&phy5>;
 				};
 
 				port@6 {