ramips: add support for Kimax U25AWF-H1

Kimax U-25AWF-H1 is is a 2,5" HDD Enclosure with Wi-Fi/Eth conection
and battery, based on MediaTek MT7620A.

Patch rewritten from: https://forum.openwrt.org/viewtopic.php?pid=305643

Specification:

- MT7620A CPU
- 64 MB of RAM
- 16 MB of FLASH
- 802.11bgn WiFi
- 1x 10/100 Mbps Ethernet
- USB 2.0 Host
- UART for serial console

Flash instruction:
1. Download lede-ramips-mt7620-u25awf-h1-squashfs-sysupgrade.bin
2. Open webinterface a upgrade
3. After boot connect via ethernet to ip 192.168.1.1

Signed-off-by: Daniel Kucera <daniel.kucera@gmail.com>
[fix reset button gpio, don't add a lan/wan vlan config for single
port board, add -H1 suffix do make sure that this revision of the
board is supported/tested]
Signed-off-by: Mathias Kresin <dev@kresin.me>

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

@@ -368,6 +368,10 @@ tl-wr841n-v13)
 	ucidef_set_led_switch "lan4" "lan4" "$board:green:lan4" "switch0" "0x10"
 	ucidef_set_led_switch "wan" "wan" "$board:green:wan" "switch0" "0x01"
 	;;
+u25awf-h1)
+	set_wifi_led "u25awf:red:wifi"
+	ucidef_set_led_netdev "eth" "eth" "u25awf:green:lan" "eth0"
+	;;
 vocore-8M|\
 vocore-16M)
 	ucidef_set_led_netdev "eth" "ETH" "vocore:orange:eth" "eth0"

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

@@ -237,6 +237,7 @@ ramips_setup_interfaces()
 	mzk-ex750np|\
 	na930|\
 	pbr-d1|\
+	u25awf-h1|\
 	wli-tx4-ag300n|\
 	wmdr-143n|\
 	wmr-300|\

target/linux/ramips/base-files/etc/diag.sh

@@ -238,6 +238,9 @@ get_status_led() {
 	sap-g3200u3)
 		status_led="$board:green:usb"
 		;;
+	u25awf-h1)
+		status_led="u25awf:red:wifi"
+		;;
 	v22rw-2x2)
 		status_led="$board:green:security"
 		;;