bmips: add support for Arcadyan AR7516

The Arcadyan AR7516, AKA Orange Bright Box or EE Bright Box 1, is a wifi
fast ethernet router, 2.4 GHz single band with two internal antennas. It
comes with a horizontal stand black shiny casing.

Newer Bright Box 1 model stands vertically, and comes with a totally
different board inside, not compatible with this firmware.

Hardware:
 - SoC: Broadcom BCM6328
 - CPU: single core BMIPS4350 V7.5 @ 320Mhz
 - RAM: 64 MB DDR2
 - Flash: 8 MB SPI NOR
 - Ethernet LAN: 4x 100Mbit
 - Wifi 2.4 GHz: Broadcom BCM43227 802.11bgn (onboard)
 - USB: 1x 2.0
 - ADSL: yes, unsupported
 - Buttons: 2x
 - LEDs: 9x, power LED is hardware controlled
 - UART: yes

Installation in two steps, new CFE bootloader and firmware:

Install new CFE:
  1. Power off the router and press the RESET button
  2. Power on the router and wait some seconds
  3. Release the RESET button
  3. Browse to http://192.168.1.1, this web interface will offer both
     firmware (“Software”) upgrade and bootloader upgrade; be sure to
     use the bootloader section of the upload form.
  4. Upload the new CFE (availabe at the wiki page)
  5. Wait about a minute for flashing to finish and reboot into the new bootloader.

Install OpenWrt via new CFE web UI:
  1. After installing the new CFE, visit http://192.168.1.1
  2. Upload the Openwrt cfe firmware
  5. Wait a few minutes for it to finish

Signed-off-by: Daniel González Cabanelas <dgcbueu@gmail.com>
(cherry-picked from df8e4b6c2e)

target/linux/bmips/bcm6328/base-files/etc/board.d/01_leds

@@ -6,6 +6,10 @@
 board_config_update
 
 case "$(board_name)" in
+arcadyan,ar7516)
+	ucidef_set_led_netdev "wan" "WAN" "green:wan" "wan"
+	ucidef_set_led_netdev "wlan0" "WiFi" "green:wifi" "phy0-ap0"
+	;;
 nucom,r5010unv2 |\
 sercomm,ad1018)
 	ucidef_set_led_usbport "usb" "USB" "green:usb" "usb1-port1" "usb2-port1"

target/linux/bmips/bcm6328/base-files/etc/board.d/02_network

@@ -5,6 +5,10 @@
 board_config_update
 
 case "$(board_name)" in
+arcadyan,ar7516)
+	ucidef_set_bridge_device switch
+	ucidef_set_interfaces_lan_wan "lan1 lan2 lan3" "wan"
+	;;
 comtrend,ar-5381u |\
 comtrend,ar-5387un |\
 nucom,r5010unv2)

target/linux/bmips/bcm6328/base-files/etc/uci-defaults/09_fix_crc

@@ -3,6 +3,7 @@
 . /lib/functions.sh
 
 case "$(board_name)" in
+arcadyan,ar7516 |\
 comtrend,ar-5381u |\
 comtrend,ar-5387un |\
 nucom,r5010unv2)