qualcommax: ipq60xx: add TP-Link EAP625-Outdoor HD v1 support

qualcommax: ipq60xx: add TP-Link EAP625-Outdoor HD v1 support

TP-Link EAP625-Outdoor HD is a 802.11ax AP claiming AX1800 support.
It is wall or pole mountable, and rated for outdoor use. It can only
be powered via PoE.

Hardware-wise, it is very similar to the older EAP610-Outdoor model.
Software-wise, I couldn't find a difference other than the board
data files, and device name. For this reason, the majority of the
devicetree from the EAP610-Outdoor is reused.

This device currently comes in a "v1", and "v1.6" version. The
"support-list" of the vendor firmware does not have a distinction
between these versions. This commit was tested on a 'V1.6" device.

Specifications:
---------------
* CPU: Qualcomm IPQ6018 Quad core Cortex-A53
* RAM: 512 MB
* Storage: 128MB NAND
* Ethernet:
  * Gigabit RJ45 port with PoE input
* WLAN:
  * 2.4GHz/5GHz
* LEDs:
  * Multi-color System LED (Green/Amber)
* Buttons:
  * 1x Reset
* UART: 4-pin unpopulated header
  * 1.8 V level, Pinout 1 - TX, 2 - RX, 3 - GND, 4 - 1.8V

Installation:
=============

Web UI method
-------------

Set up the device using the vendor's web UI. After that go to
Management->SSH and enable the "SSH Login" checkbox. Select "Save".
The connect to the machine via SSH:

ssh -o hostkeyalgorithms=ssh-rsa <ip_of_device>

Disable signature verification:

cliclientd stopcs

Rename the "-web-ui-factory" image to something less than 63
characters, maintaining the ".bin" suffix.
 * Go to System -> Firmware Update.
 * Under "New Firmware File", click "Browse" and select the image
 * Select "Update" and confirm by clicking "OK".

If the update fails, the web UI should show an error message.
Otherwise, the device should reboot into OpenWRT.

NOTE: If ssh continues to complain that "no matching host key type
found. Their offer: ssh-rsa,ssh-dss" it likely means that yor distro
has completely disabled deprecated siphers in ssh. In that case, run
the ssh command from a docker container of an older distro.

TFTP method
-----------

To flash via tftp, first place the initramfs image on the TFTP server.

setenv serverip <ip of tftp server>
setenv ipaddr <ip in same subnet as tftp server>
tftpboot tplink_eap625-outdoor-hd-v1-initramfs-uImage.itb
bootm

This should boot OpenWRT. Once booted, flash the sysupgrade.bin image
using either luci or the commandline.

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/18584
Signed-off-by: Robert Marko <robimarko@gmail.com>