ramips: add support for Blueendless Kimax U35WF

Blueendless Kimax U35WF is a 3,5" HDD Enclosure with Wi-Fi and Ethernet

Patch rewritten from: https://forum.openwrt.org/viewtopic.php?id=66908
Based on: https://github.com/lede-project/source/pull/965

Specification:
- SoC: MediaTek MT7620N
- CPU/Speed: 580 MHz
- Flash-Chip: KH25L12835F Spi Flash
- Flash size: 16 MiB
- RAM: 64 MiB
- LAN: 1x 100 Mbps Ethernet
- WiFi SoC-integrated: 802.11bgn
- 1x USB 2.0
- UART: for serial console

Installation:
1. Download sysupgrade.bin
2. Open vendor web interface
3. Choose to upgrade firmware
3. After reboot connect via ethernet at 192.168.1.1

Signed-off-by: Ademar Arvati Filho <arvati@hotmail.com>

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

@@ -245,6 +245,10 @@ ht-tm02)
 	ucidef_set_led_netdev "eth" "Ethernet" "$boardname:green:lan" "eth0"
 	set_wifi_led "$boardname:blue:wlan"
 	;;
+kimax,u35wf)
+	set_wifi_led "$boardname:blue:wifi"
+	ucidef_set_led_netdev "eth" "ETH" "$boardname:green:eth" "eth0"
+	;;
 kn|\
 nbg-419n2)
 	set_usb_led "$boardname:green:usb"

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

@@ -49,6 +49,7 @@ ramips_setup_interfaces()
 	dcs-930|\
 	dcs-930l-b1|\
 	ht-tm02|\
+	kimax,u35wf|\
 	linkits7688 | \
 	m2m|\
 	microwrt|\

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

@@ -199,12 +199,13 @@ get_status_led() {
 	hc5962)
 		status_led="$boardname:white:status"
 		;;
-	linkits7688)
-		status_led="linkit-smart-7688:orange:wifi"
-		;;
+	kimax,u35wf|\
 	m2m)
 		status_led="$boardname:blue:wifi"
 		;;
+	linkits7688)
+		status_led="linkit-smart-7688:orange:wifi"
+		;;
 	gl-mt300n-v2)
 		status_led="$boardname:green:power"
 		;;

target/linux/ramips/base-files/lib/upgrade/platform.sh

@@ -83,6 +83,7 @@ platform_check_image() {
 	jhr-n825r|\
 	jhr-n926r|\
 	k2p|\
+	kimax,u35wf|\
 	kn|\
 	kn_rc|\
 	kn_rf|\