ramips: add support for Netgear WN3000RPv3

This patch adds support for the Netgear WN3000RPv3
http://www.netgear.com/support/product/wn3000rpv3.aspx

Specifications:
- SoC: MediaTek MT7620A (580MHz, ramips)
- RAM: 32MB DDR
- Storage: 8MB NOR SPI flash
- Wireless: builtin MT7620A, 2x2:2 with u.FL connectors
- Ethernet: 1x100M
- Serial: JP1 header, 57600-8N1
- Stock firmware based on OpenWRT Kamikaze

Like the EX2700, the bootloader expects a secondary image signature,
see https://forum.openwrt.org/viewtopic.php?pid=312577#p312577
This is why the same fakeroot image is used for the WN3000

Signed-off-by: Thibaut VARENE <hacks@slashdirt.org>

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

@@ -155,7 +155,8 @@ vr500)
 dir-860l-b1)
 	ucidef_set_led_netdev "wan" "wan" "$board:green:net" "eth0.2"
 	;;
-ex2700)
+ex2700|\
+wn3000rpv3)
 	ucidef_set_led_default "power_r" "POWER (red)" "$board:red:power" "0"
 	set_wifi_led "$board:green:router"
 	;;

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

@@ -58,6 +58,7 @@ ramips_setup_interfaces()
 	timecloud|\
 	w150m|\
 	widora-neo|\
+	wn3000rpv3|\
 	wnce2001|\
 	zbt-cpe102|\
 	zte-q7)

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

@@ -53,7 +53,8 @@ get_status_led() {
 	jhr-n825r|\
 	mpr-a1|\
 	mpr-a2|\
-	mzk-ex750np)
+	mzk-ex750np|\
+	wn3000rpv3)
 		status_led="$board:red:power"
 		;;
 	ac1200pro|\

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

@@ -553,6 +553,9 @@ ramips_board_detect() {
 	*"WMR-300")
 		name="wmr-300"
 		;;
+	*"WN3000RPv3")
+		name="wn3000rpv3"
+		;;
 	*"WNCE2001")
 		name="wnce2001"
 		;;

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

@@ -157,6 +157,7 @@ platform_check_image() {
 	wli-tx4-ag300n|\
 	wlr-6000|\
 	wmr-300|\
+	wn3000rpv3|\
 	wnce2001|\
 	wndr3700v5|\
 	wr512-3gn|\