lantiq: remove ar9_lantiq_easy50810.dts

This file seems to be orphaned, no device setup existing for it.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/lantiq/files/arch/mips/boot/dts/lantiq/ar9_lantiq_easy50810.dts

-/dts-v1/;
-
-#include "ar9.dtsi"
-
-/ {
-	compatible = "lantiq,easy50810", "lantiq,xway", "lantiq,ar9";
-	model = "Lantiq EASY50810";
-
-	chosen {
-		bootargs = "console=ttyLTQ0,115200";
-	};
-
-	memory@0 {
-		device_type = "memory";
-		reg = <0x0 0x2000000>;
-	};
-};
-
-&gpio {
-	pinctrl-names = "default";
-	pinctrl-0 = <&state_default>;
-
-	state_default: pinmux {
-		exin {
-			lantiq,groups = "exin1";
-			lantiq,function = "exin";
-		};
-	};
-};
-
-&gsw {
-	phy-mode = "rmii";
-};
-
-&localbus {
-	flash@0 {
-		compatible = "lantiq,nor";
-		bank-width = <2>;
-		reg = <0 0x0 0x2000000>;
-
-		partitions {
-			compatible = "fixed-partitions";
-			#address-cells = <1>;
-			#size-cells = <1>;
-
-			partition@0 {
-				label = "uboot";
-				reg = <0x00000 0x10000>; /* 64 KB */
-			};
-
-			partition@10000 {
-				label = "uboot_env";
-				reg = <0x10000 0x10000>; /* 64 KB */
-			};
-
-			partition@20000 {
-				label = "firmware";
-				reg = <0x20000 0x3d0000>;
-			};
-
-			partition@400000 {
-				label = "rootfs";
-				reg = <0x400000 0x400000>;
-			};
-		};
-	};
-};
-
-&stp {
-	status = "okay";
-	lantiq,shadow = <0xfff>;
-	lantiq,groups = <0x3>;
-};