ramips: add support for Netgear EX3700

Specifications:
* SoC: MT7620A
* RAM: 64 MB DDR
* Flash: 8MB NOR SPI flash
* WiFi: MT7612E (5Ghz) and builtin MT7620A (2.4GHz)
* LAN: 1x100M

The -factory images can be flashed from the device's web
interface or via nmrpflash.

Co-authored-by: Paul Oranje <por@xs4all.nl>
Signed-off-by: Paul Oranje <por@xs4all.nl>
Signed-off-by: Joseph C. Lehner <joseph.c.lehner@gmail.com>

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

@@ -165,6 +165,10 @@ wn3000rpv3)
 	ucidef_set_led_default "power_r" "POWER (red)" "$board:red:power" "0"
 	set_wifi_led "$board:green:router"
 	;;
+ex3700)
+	ucidef_set_led_netdev "wlan5g" "ROUTER (green)" "$board:green:router" "wlan0"
+	ucidef_set_led_netdev "wlan2g" "DEVICE (green)" "$board:green:device" "wlan1"
+	;;
 f5d8235-v1)
 	ucidef_set_led_default "lan" "lan" "$board:blue:wired" "0"
 	set_usb_led "$board:blue:storage"

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

@@ -190,6 +190,7 @@ ramips_setup_interfaces()
 	d105|\
 	dch-m225|\
 	ex2700|\
+	ex3700|\
 	hpm|\
 	mzk-ex300np|\
 	mzk-ex750np|\

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

@@ -23,6 +23,7 @@ get_status_led() {
 	dch-m225|\
 	dir-860l-b1|\
 	e1700|\
+	ex3700|\
 	fonera20n|\
 	kn_rc|\
 	kn_rf|\

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

@@ -190,6 +190,9 @@ ramips_board_detect() {
 	*"EX2700")
 		name="ex2700";
 		;;
+	*"EX3700")
+		name="ex3700"
+		;;
 	*"F5D8235 v1")
 		name="f5d8235-v1"
 		;;

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

@@ -55,6 +55,7 @@ platform_check_image() {
 	esr-9753|\
 	ew1200|\
 	ex2700|\
+	ex3700|\
 	f7c027|\
 	firewrt|\
 	fonera20n|\