ramips: add support for DLINK DIR-510L

The DIR-510L Wireless Router are based on the MT7620A SoC.

Specification:

-MediaTek MT7620A (580 Mhz)
-128 MB of RAM
-16 MB of FLASH
-802.11bgn radio
-1x 10/100 Mbps Ethernet
-2x internal, non-detachable antennas
-UART (J3) header on PCB (57600 8n1)
-1x bi-color LED (GPIO-controlled), 2x button
-JBOOT bootloader

Known issues:
-Ethernet port is used as LAN
-No communication with charger IC. (uart bitbang needed)

Installation:
Apply factory image via d-link http web-gui.

How to revert to OEM firmware:
1.) Push the reset button and turn on the power. Wait until LED start blinking (~10sec.)
2.) Upload original factory image via JBOOT http (IP: 192.168.123.254)
3.) If http doesn't work, it can be done with curl command:
    curl -F FN=@XXXXX.bin http://192.168.123.254/upg
    where XXXXX.bin is name of firmware file.

Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>
[fixed whitespace issue in 10-rt2x00-eeprom]
Signed-off-by: Petr Štetiar <ynezz@true.cz>

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

@@ -365,6 +365,7 @@ ramips_setup_interfaces()
 		ucidef_add_switch "switch0" \
 			"0:lan:4" "1:lan:3" "2:lan:2" "3:lan:1" "5:wan" "6@eth0"
 		;;
+	dlink,dir-510l|\
 	re350-v1)
 		ucidef_add_switch "switch0" \
 			"0:lan" "6@eth0"
@@ -513,6 +514,7 @@ ramips_setup_macs()
 		lan_mac=$(mtd_get_mac_ascii factory lanmac)
 		wan_mac=$(mtd_get_mac_ascii factory wanmac)
 		;;
+	dlink,dir-510l|\
 	dlink,dwr-116-a1|\
 	dlink,dwr-118-a1|\
 	dlink,dwr-118-a2|\

target/linux/ramips/base-files/etc/board.d/03_gpio_switches

@@ -7,6 +7,10 @@ board_config_update
 board=$(board_name)
 
 case "$board" in
+dlink,dir-510l)
+	ucidef_add_gpio_switch "usb_enable1" "USB 1A enable" "12" "0"
+	ucidef_add_gpio_switch "usb_enable05" "USB 0.5A enable" "13" "1"
+	;;
 mikrotik,rb750gr3)
 	ucidef_add_gpio_switch "poe_passthrough" "PoE Passthrough" "17"
 	;;

target/linux/ramips/base-files/etc/hotplug.d/firmware/10-rt2x00-eeprom

@@ -54,6 +54,7 @@ board=$(board_name)
 case "$FIRMWARE" in
 "soc_wmac.eeprom")
 	case $board in
+	dlink,dir-510l|\
 	dlink,dwr-116-a1|\
 	dlink,dwr-118-a1|\
 	dlink,dwr-118-a2|\