dts: r4pro: add eth-mux (now working so far)

Author: frank-w

arch/arm64/boot/dts/mediatek/mt7988a-bananapi-bpi-r4-pro-8x.dts

@@ -6,13 +6,13 @@
 		     "mediatek,mt7988a";
 };
 
-/*&eth {
+&eth {
 	mux: mux-bus {
 		#address-cells = <1>;
 		#size-cells = <0>;
 		mux1: ethernet-mux@1 {
 			compatible = "mediatek,eth-mux";
-			reg = <1>;
+			reg = <1>; //map to gmac1
 			chan-sel-gpios = <&pio 3 GPIO_ACTIVE_HIGH>;
 			mod-def0-gpios = <&pio 1 GPIO_ACTIVE_LOW>; //also moddef0 of sfp2
 			sfp-present-channel = <1>;
@@ -35,7 +35,7 @@
 			};
 		};
 	};
-};*/
+};
 
 &gmac1 {
 	phy-mode = "usxgmii";