ath79: add support for I-O DATA WN-AC1600DGR2

I-O DATA WN-AC1600DGR2 is a 2.4/5 GHz band 11ac router, based on
Qualcomm Atheros QCA9557.

Specification:

- Qualcomm Atheros QCA9557
- 128 MB of RAM
- 16 MB of Flash
- 2.4/5 GHz wifi
  - 2.4 GHz: 2T2R (SoC internal)
  - 5 GHz: 3T3R (QCA9880)
- 5x 10/100/1000 Mbps Ethernet
- 6x LEDs, 6x keys (4x buttons, 1x slide switch)
- UART header on PCB
  - Vcc, GND, TX, RX from ethernet port side
  - 115200n8

Flash instruction using factory image:

1. Connect the computer to the LAN port of WN-AC1600DGR2
2. Connect power cable to WN-AC1600DGR2 and turn on it
3. Access to "http://192.168.0.1/" and open firmware update page
("ファームウェア")
4. Select the OpenWrt factory image and click update ("更新") button
5. Wait ~150 seconds to complete flashing

Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>

target/linux/ath79/base-files/etc/board.d/02_network

@@ -46,6 +46,11 @@ ath79_setup_interfaces()
 	glinet,ar300m)
 		ucidef_set_interfaces_lan_wan "eth1" "eth0"
 		;;
+	iodata,wn-ac1600dgr2|\
+	pcs,cr5000)
+		ucidef_add_switch "switch0" \
+			"0@eth0" "1:lan" "2:lan" "3:lan" "4:lan" "5:wan"
+		;;
 	netgear,wndr3800)
 		ucidef_set_interfaces_lan_wan "eth0" "eth1"
 		ucidef_add_switch "switch0" \
@@ -66,10 +71,6 @@ ath79_setup_interfaces()
 			"0@eth1" "1:lan:1" "2:lan:4" "3:lan:3" "4:lan:2"
 		ucidef_set_interface_wan "eth0"
 		;;
-	pcs,cr5000)
-		ucidef_add_switch "switch0" \
-			"0@eth0" "1:lan" "2:lan" "3:lan" "4:lan" "5:wan"
-		;;
 	phicomm,k2t)
 		ucidef_add_switch "switch0" \
 			"0@eth0" "3:lan:1" "5:lan:2" "4:wan"
@@ -152,6 +153,10 @@ ath79_setup_macs()
 		lan_mac=$(mtd_get_mac_text "caldata" 65440)
 		wan_mac=$(mtd_get_mac_text "caldata" 65460)
 		;;
+	iodata,wn-ac1600dgr2)
+		lan_mac=$(mtd_get_mac_ascii u-boot-env ethaddr)
+		wan_mac=$(mtd_get_mac_ascii u-boot-env wanaddr)
+		;;
 	phicomm,k2t)
 		lan_mac=$(k2t_get_mac "lan_mac")
 		wan_mac=$(k2t_get_mac "wan_mac")