ath79: add support for ALFA Network Tube-2HQ

ALFA Network Tube-2HQ is a successor of the Tube-2H/P series (EOL) which
was based on the Atheros AR9331. The new version uses Qualcomm QCA9531.

Specifications:

- Qualcomm/Atheros QCA9531 v2
- 650/400/200 MHz (CPU/DDR/AHB)
- 64 or 128 MB of RAM (DDR2)
- 16+ MB of flash (SPI NOR)
- 1x 10/100 Mbps Ethernet with passive PoE input (24 V)
  (802.3at/af PoE support with optional module)
- 1T1R 2.4 GHz Wi-Fi with external PA (SE2623L, up to 27 dBm) and LNA
- 1x Type-N (male) antenna connector
- 6x LED (5x driven by GPIO)
- 1x button (reset)
- external h/w watchdog (EM6324QYSP5B, enabled by default)
- UART (4-pin, 2.00 mm pitch) header on PCB

Flash instruction:

You can use sysupgrade image directly in vendor firmware which is based
on LEDE/OpenWrt. Alternatively, you can use web recovery mode in U-Boot:

1. Configure PC with static IP 192.168.1.2/24.
2. Connect PC with one of RJ45 ports, press the reset button, power up
   device, wait for first blink of all LEDs (indicates network setup),
   then keep button for 3 following blinks and release it.
3. Open 192.168.1.1 address in your browser and upload sysupgrade image.

Signed-off-by: Piotr Dymacz <pepe2k@gmail.com>

target/linux/ath79/generic/base-files/etc/board.d/01_leds

@@ -48,6 +48,14 @@ alfa-network,r36a)
 	ucidef_set_led_netdev "lan" "LAN" "blue:lan" "eth0"
 	ucidef_set_led_switch "wan" "WAN" "blue:wan" "switch0" "0x10"
 	;;
+alfa-network,tube-2hq)
+	ucidef_set_led_netdev "lan" "LAN" "blue:lan" "eth0"
+	ucidef_set_rssimon "wlan0" "200000" "1"
+	ucidef_set_led_rssi "signal1" "SIGNAL1" "red:signal1" "wlan0" "1" "100"
+	ucidef_set_led_rssi "signal2" "SIGNAL2" "orange:signal2" "wlan0" "25" "100"
+	ucidef_set_led_rssi "signal3" "SIGNAL3" "green:signal3" "wlan0" "50" "100"
+	ucidef_set_led_rssi "signal4" "SIGNAL4" "green:signal4" "wlan0" "75" "100"
+	;;
 asus,rp-ac66)
 	ucidef_set_rssimon "wlan0" "200000" "1"
 	ucidef_set_rssimon "wlan1" "200000" "1"

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

@@ -13,6 +13,7 @@ ath79_setup_interfaces()
 	allnet,all-wap02860ac|\
 	alfa-network,ap121f|\
 	alfa-network,pi-wifi4|\
+	alfa-network,tube-2hq|\
 	arduino,yun|\
 	aruba,ap-105|\
 	asus,rp-ac66|\
@@ -529,6 +530,7 @@ ath79_setup_macs()
 	alfa-network,n5q|\
 	alfa-network,pi-wifi4|\
 	alfa-network,r36a|\
+	alfa-network,tube-2hq|\
 	engenius,eap300-v2|\
 	engenius,ens202ext-v1)
 		label_mac=$(mtd_get_mac_binary art 0x1002)