ath79: add support for TP-Link TL-WR941ND v5

Specifications:
- SoC: ar9341
- RAM: 32M
- Flash: 4M
- Ethernet: 5x FE ports
- WiFi: ar9341-wmac

Flash instruction:
Upload generated factory firmware on vendor's web interface.

This device is very similar to the TL-WR841N v8, only two LED GPIOs are
different.
Buttons configuration is similar to TL-WR842ND v2 but both buttons are
active low.

Signed-off-by: Will Moss <willormos@gmail.com>

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

@@ -65,7 +65,8 @@ tplink,tl-mr3420-v2|\
 tplink,tl-wr740n-v4|\
 tplink,tl-wr740n-v5|\
 tplink,tl-wr741nd-v4|\
-tplink,tl-wr841-v8)
+tplink,tl-wr841-v8|\
+tplink,tl-wr941nd-v5)
 	ucidef_set_led_netdev "wan" "WAN" "green:wan" "eth1"
 	ucidef_set_led_switch "lan1" "LAN1" "green:lan1" "switch0" "0x04"
 	ucidef_set_led_switch "lan2" "LAN2" "green:lan2" "switch0" "0x08"

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

@@ -84,7 +84,8 @@ ath79_setup_interfaces()
 	tplink,tl-wr740n-v4|\
 	tplink,tl-wr740n-v5|\
 	tplink,tl-wr741nd-v4|\
-	tplink,tl-wr841-v8)
+	tplink,tl-wr841-v8|\
+	tplink,tl-wr941nd-v5)
 		ucidef_set_interface_wan "eth1"
 		ucidef_add_switch "switch0" \
 			"0@eth0" "1:lan:4" "2:lan:1" "3:lan:2" "4:lan:3"