ramips: add support for ipTIME A1004ns

ipTIME A1004ns is a 2.4/5GHz band AC750 router, based on MediaTek MT7620A.

Specifications:
- SoC: MT7620A
- RAM: DDR2 128MB
- Flash: SPI NOR 16MB
- WiFi:
  - 2.4GHz: SoC internal
  - 5GHz: MT7610EN
- Ethernet: 5x 10/100/1000Mbps
  - Switch: MT7530BU
- USB: 1x 2.0
- UART:
  - J2: 3.3V, TX, RX, GND (3.3V is the square pad) / 57600 8N1

Installation via web interface:
1.  Flash **initramfs** image through the stock web interface.
2.  Boot into OpenWrt and perform sysupgrade with sysupgrade image.

Revert to stock firmware:
1.  Perform sysupgrade with stock image.

Signed-off-by: Sungbo Eo <mans0n@gorani.run>

target/linux/ramips/mt7620/base-files/etc/board.d/02_network

@@ -143,7 +143,8 @@ ramips_setup_interfaces()
 			"0:lan" "1:lan" "5:wan" "6@eth0"
 		;;
 	iodata,wn-ac1167gr|\
-	iodata,wn-ac733gr3)
+	iodata,wn-ac733gr3|\
+	iptime,a1004ns)
 		ucidef_add_switch "switch0"
 		ucidef_add_switch_attr "switch0" "enable" "false"
 		ucidef_add_switch "switch1" \
@@ -312,6 +313,9 @@ ramips_setup_macs()
 	iodata,wn-ac733gr3)
 		wan_mac=$(mtd_get_mac_ascii u-boot-env wanaddr)
 		;;
+	iptime,a1004ns)
+		wan_mac=$(mtd_get_mac_binary u-boot 0x1fc40)
+		;;
 	iptime,a104ns)
 		wan_mac=$(macaddr_add "$(mtd_get_mac_binary u-boot 0x1fc20)" 2)
 		;;