[][kernel][mt7986][eth][Change single PHY driver for Maxlinear GPY211]

[Description]
Change single PHY driver for Maxlinear GPY211.

If without this patch, kernel can't get the link speed and dynamic switch link mode for HSGMII.

[Release-log]
N/A

Change-Id: I89b145873eba02726722a783bca37f59aa1ce1c8
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6547293
diff --git a/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7986a-2500wan-gsw-spim-nand-rfb.dts b/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7986a-2500wan-gsw-spim-nand-rfb.dts
index c33a8ac..6f23b2f 100644
--- a/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7986a-2500wan-gsw-spim-nand-rfb.dts
+++ b/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7986a-2500wan-gsw-spim-nand-rfb.dts
@@ -101,14 +101,7 @@
 		compatible = "mediatek,eth-mac";
 		reg = <1>;
 		phy-mode = "2500base-x";
-
-		fixed-link {
-			speed = <2500>;
-			full-duplex;
-			pause;
-			link-gpio = <&pio 46 0>;
-			phy-handle = <&phy6>;
-		};
+		phy-handle = <&phy6>;
 	};
 
 	mdio: mdio-bus {
@@ -124,7 +117,7 @@
 		};
 
 		phy6: phy@6 {
-			compatible = "ethernet-phy-id67c9.de0a";
+			compatible = "ethernet-phy-ieee802.3-c45";
 			reg = <6>;
 		};
 	};
@@ -148,7 +141,6 @@
 			speed = <2500>;
 			full-duplex;
 		};
-
 	};
 
 	port6: port@6 {