ath79: Add support for TP-Link TL-WR1043N v5

ath79: Add support for TP-Link TL-WR1043N v5

Specifications:

 - QCA9563 at 775 MHz
 - 64 MB RAM Zentel A3R12E40CBF-8E
 - 16 MB flash Winbond W25Q128FVSG
 - 3 (non-detachable) Antennas / 450 Mbit
 - 1x/4x WAN/LAN Gbps Ethernet (QCA8337)
 - reset and Wi-Fi buttons

TP-Link TL-WR1043N v5 appears to be identical to the TL-WR1043ND v4,
except that the USB port has been removed and there is no longer a
removable antenna option. It also has different partitioning scheme.

The software is more in line with the Archer series in that it uses a
nested bootloader scheme.

(This has been adapted from the OpenWrt Wiki page)
<https://openwrt.org/toh/tp-link/tl-wr1043nd>

Installation on HW rev.5:

Factory firmware can be installed via the WEB interface.

Alternatively, it is also possible to use a TFTP server
for recovery purposes:
 - Rename OpenWRT or original firmware to WR1043v5_tp_recovery.bin
 - Set static IP of your PC to *192.168.0.66*
 - Router will obtain IP 192.168.0.86 for a few seconds while
   loading, when reset button pressed at power On.

And finally, there's always u-boot access through the UART.
For information visit the wiki.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
[reworked commit message]