ath79-generic: add support for DLAN (pro) 1200+ WiFi ac

[maurerle]

The DLAN pro 1200+ WiFi ac is the same as the DLAN 1200+ WiFi ac (non-pro).
It is a wall plug device which still exposes the wall plug.

The powerline functionality does not work without additional firmware, which can not be shipped due to licensing issues - yet someone from our community wanted to use this device for FF and did test it.

Looks fine to me, except that there is no Power LED, just the House-LED (used for powerline) and the WIFI-LED (which works as expected)

• Must be flashable from vendor firmware
  • Web interface
  • TFTP see: https://openwrt.org/toh/devolo/dlan_pro_1200_wifi_ac#oem_installation_using_the_tftp_method
  • Other:
• Must support upgrade mechanism
  • Must have working sysupgrade
    • Must keep/forget configuration (sysupgrade [-n], firstboot)
  • Gluon profile name matches autoupdater image name
    (lua -e 'print(require("platform_info").get_image_name())')
    devolo-dlan-pro-1200+-wifi-ac
• Reset/WPS/... button must return device into config mode
• Primary MAC address should match address on device label (or packaging)
  (https://gluon.readthedocs.io/en/latest/dev/hardware.html#hardware-support-in-packages)
  • When re-adding a device that was supported by an earlier version of Gluon, a
    factory reset must be performed before checking the primary MAC address, as
    the setting from the old version is not reset otherwise.
• Wired network
  • should support all network ports on the device
  • must have correct port assignment (WAN/LAN)
    • if there are multiple ports but no WAN port:
      • the PoE input should be WAN, all other ports LAN
      • otherwise the first port should be declared as WAN, all other ports LAN
• Wireless network (if applicable)
  • Association with AP must be possible on all radios
  • Association with 802.11s mesh must work on all radios
  • AP+mesh mode must work in parallel on all radios
• LED mapping
  • Power/system LED (non exists)
    • Lit while the device is on
    • Should display config mode blink sequence
      (https://gluon.readthedocs.io/en/latest/features/configmode.html)
  • Radio LEDs (only 1 wifi LED)
    • Should map to their respective radio
    • Should show activity
  • Switch port LEDs (non)
    - [ ] Should map to their respective port (or switch, if only one led present)
    - [ ] Should show link state and activity
• Docs:
  • Added Device to docs/user/supported_devices.rst