ramips: add support for TP-Link Archer C20 v4

TP-Link Archer C20 v4 is a router with 5-port FE switch and
non-detachable antennas. It's based on MediaTek MT7628N+MT7610EN.

Specification:
- MediaTek MT7628N/N (580 Mhz)
- 64 MB of RAM
- 8 MB of FLASH
- 2T2R 2.4 GHz and 1T1R 5 GHz
- 5x 10/100 Mbps Ethernet
- 3x external, non-detachable antennas
- UART (J1) header on PCB (115200 8n1)
- 7x LED (GPIO-controlled*), 2x button, power input switch

* WAN LED in this devices is a dual-color, dual-leads type which isn't
  (fully) supported by gpio-leds driver. This type of LED requires both
  GPIOs state change at the same time to select color or turn it off.
  For now, we support/use only the green part of the LED.
* MT7610EN ac chip isn't not supported by LEDE. Therefore 5Ghz won't
  work.

Flash instruction:

The only way to flash LEDE image in ArcherC20v4 is to use
tftp recovery mode in U-Boot:

1. Configure PC with static IP 192.168.0.66/24 and tftp server.
2. Rename "openwrt-ramips-mt7628-ArcherC20v4-squashfs-tftp-recovery.bin"
   to "tp_recovery.bin" and place it in tftp server directory.
3. Connect PC with one of LAN ports, press the reset button, power up
   the router and keep button pressed for around 6-7 seconds, until
   device starts downloading the file.
4. Router will download file from server, write it to flash and reboot.

Signed-off-by: Maxim Anisimov <maxim.anisimov.ua@gmail.com>

target/linux/ramips/image/mt76x8.mk

@@ -139,6 +139,19 @@ define Device/tl-wr841n-v13
 endef
 TARGET_DEVICES += tl-wr841n-v13
 
+define Device/tplink_c20-v4
+  $(Device/tplink)
+  DTS := ArcherC20v4
+  IMAGE_SIZE := 7808k
+  DEVICE_TITLE := TP-Link ArcherC20 v4
+  TPLINK_FLASHLAYOUT := 8Mmtk
+  TPLINK_HWID := 0xc200004
+  TPLINK_HWREV := 0x1
+  TPLINK_HWREVADD := 0x4
+  TPLINK_HVERSION := 3
+endef
+TARGET_DEVICES += tplink_c20-v4
+
 define Device/tplink_tl-mr3420-v5
   $(Device/tplink)
   DTS := TL-MR3420V5