[][kernel][mt7981][eth][Fix FC mis-match issue in externel phy]

[Description]
Fix FC mis-match issue in externel phy, the issue will cause a decrease
in T-put.

[Release-log]
N/A


Change-Id: Ib47fbee55b2cf78df79e41a3207091ba172d29f5
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7248826
diff --git a/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7981-spim-nand-2500wan-gmac2.dts b/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7981-spim-nand-2500wan-gmac2.dts
index 396f483..ad398b9 100644
--- a/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7981-spim-nand-2500wan-gmac2.dts
+++ b/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7981-spim-nand-2500wan-gmac2.dts
@@ -98,25 +98,19 @@
                 compatible = "mediatek,eth-mac";
                 reg = <1>;
                 phy-mode = "2500base-x";
-
-                fixed-link {
-                        speed = <2500>;
-                        full-duplex;
-                        pause;
-                };
+		phy-handle = <&phy5>;
         };
 
         mdio: mdio-bus {
                 #address-cells = <1>;
                 #size-cells = <0>;
 
+		reset-gpios = <&pio 14 1>;
+		reset-delay-us = <600>;
+
 		phy5: phy@5 {
-			compatible = "ethernet-phy-id67c9.de0a";
+			compatible = "ethernet-phy-ieee802.3-c45";
 			reg = <5>;
-			reset-gpios = <&pio 14 1>;
-			reset-assert-us = <600>;
-			reset-deassert-us = <20000>;
-			phy-mode = "2500base-x";
 		};
 
                 switch@0 {