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

[Description]
Rollback external PHY0 DTS configuratoin.

If without this patch, Switch(SGMII0) will link down when LAN5 does not link up 2.5G.

[Release-log]
N/A

Change-Id: Ief87c73c7e39a592475294e8a81946b85c7844c3
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6396148
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 153ac09..6de3edc 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
@@ -88,7 +88,15 @@
 		compatible = "mediatek,eth-mac";
 		reg = <0>;
 		phy-mode = "2500base-x";
-		phy-handle = <&phy5>;
+
+		fixed-link {
+			speed = <2500>;
+			full-duplex;
+			pause;
+			link-gpio = <&pio 47 0>;
+			phy-handle = <&phy5>;
+			label = "lan5";
+		};
 	};
 
 	gmac1: mac@1 {
@@ -106,7 +114,7 @@
 		reset-delay-us = <600>;
 
 		phy5: phy@5 {
-			compatible = "ethernet-phy-ieee802.3-c45";
+			compatible = "ethernet-phy-id67c9.de0a";
 			reg = <5>;
 		};