mediatek: correct address of ethernet PHY

We still have no driver for the PHY, however we can fix it's
address.

Signed-off-by: David Bauer <[email protected]>

target/linux/mediatek/dts/mt7622-ubnt-unifi-6-lr.dtsi

@@ -172,10 +172,10 @@
 		#address-cells = <1>;
 		#size-cells = <0>;
 
-		ethernet-phy@8 {
+		ethernet-phy@7 {
 			/* Marvell AQRate AQR112W - no driver */
 			compatible = "ethernet-phy-ieee802.3-c45";
-			reg = <0x8>;
+			reg = <0x7>;
 		};
 	};
 };