ramips: create new dtsi for Arcadyan routers

This commit moves common properties for the boards below to a new dtsi:
Beeline Smartbox Flash (Arcadyan WG443223)
MTS WG430223 (Arcadyan WG430223)

The boards are almost the same. Here is the differences:
+------+----------+----------+
|      | WG430223 | WG443223 |
+------+----------+----------+
| RAM  | 128      | 256      |
+------+----------+----------+
| USB  | -        | 1x3.0    |
+------+----------+----------+
| LEDS | RG       | RGB      |
+------+----------+----------+

Signed-off-by: Mikhail Zhilkin <csharper2005@gmail.com>

target/linux/ramips/dts/mt7621_arcadyan_wg4xx223.dtsi

@@ -0,0 +1,198 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "mt7621.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/leds/common.h>
+
+/ {
+	aliases {
+		led-boot = &led_status_red;
+		led-failsafe = &led_status_red;
+		led-running = &led_status_green;
+		led-upgrade = &led_status_red;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_status_green: led-1 {
+			label = "green:status";
+			color = <LED_COLOR_ID_GREEN>;
+			function = LED_FUNCTION_STATUS;
+			gpios = <&gpio 15 GPIO_ACTIVE_LOW>;
+		};
+
+		led_status_red: led-2 {
+			label = "red:status";
+			color = <LED_COLOR_ID_RED>;
+			function = LED_FUNCTION_STATUS;
+			gpios = <&gpio 16 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+	keys {
+		compatible = "gpio-keys";
+
+		reset {
+			label = "reset";
+			gpios = <&gpio 3 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+	};
+
+	ubi-concat {
+		compatible = "mtd-concat";
+		devices = <&ubiconcat0 &ubiconcat1>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "ubi";
+				reg = <0x0 0x5240000>;
+			};
+		};
+	};
+};
+
+&nand {
+	status = "okay";
+
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		partition@0 {
+			label = "u-boot";
+			reg = <0x0 0x100000>;
+			read-only;
+		};
+
+		partition@100000 {
+			label = "u-boot-env";
+			reg = <0x100000 0x100000>;
+		};
+
+		factory: partition@200000 {
+			label = "Factory";
+			reg = <0x200000 0x100000>;
+			read-only;
+
+			compatible = "nvmem-cells";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			/* We keep the block below to prevent eth0 MAC
+			 * from randomization. Unique WAN, LAN, WLAN MACs
+			 * are stored in u-boot-env.
+			 */
+
+			/* Default Ralink MAC (00:0c:43:28:80:xx) */
+			macaddr_factory_fff0: macaddr@fff0 {
+				reg = <0xfff0 0x6>;
+			};
+		};
+
+		partition@300000 {
+			label = "firmware";
+			reg = <0x300000 0x2000000>;
+
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "kernel";
+				reg = <0x0 0x440000>;
+			};
+
+			ubiconcat0: partition@400000 {
+				label = "ubiconcat0";
+				reg = <0x440000 0x1bc0000>;
+			};
+		};
+
+		partition@2300000 {
+			label = "Firmware2";
+			reg = <0x2300000 0x2000000>;
+			read-only;
+		};
+
+		partition@4300000 {
+			label = "glbcfg";
+			reg = <0x4300000 0x200000>;
+			read-only;
+		};
+
+		partition@4500000 {
+			label = "board_data";
+			reg = <0x4500000 0x100000>;
+			read-only;
+		};
+
+		partition@4600000 {
+			label = "glbcfg2";
+			reg = <0x4600000 0x200000>;
+			read-only;
+		};
+
+		partition@4800000 {
+			label = "board_data2";
+			reg = <0x4800000 0x100000>;
+			read-only;
+		};
+
+		ubiconcat1: partition@4900000 {
+			label = "ubiconcat1";
+			reg = <0x4900000 0x3680000>;
+		};
+	};
+};
+
+&pcie {
+	status = "okay";
+};
+
+&pcie0 {
+	wifi@0,0 {
+		compatible = "mediatek,mt76";
+		reg = <0x0000 0 0 0 0>;
+		mediatek,mtd-eeprom = <&factory 0x0>;
+	};
+};
+
+&gmac0 {
+	nvmem-cells = <&macaddr_factory_fff0>;
+	nvmem-cell-names = "mac-address";
+};
+
+&switch0 {
+	ports {
+		port@2 {
+			status = "okay";
+			label = "lan2";
+		};
+
+		port@3 {
+			status = "okay";
+			label = "lan1";
+		};
+
+		port@4 {
+			status = "okay";
+			label = "wan";
+		};
+	};
+};
+
+&state_default {
+	gpio {
+		groups = "i2c", "jtag";
+		function = "gpio";
+	};
+};