ramips: some minor FDT improvements for HiWiFi devices

ramips: some minor FDT improvements for HiWiFi devices

This patch contains various minor FDT improvements for ramips
HiWiFi series devices:

* Add mt76 driver compatibles.
* Remove useless platform compatibles.
* Add default USB LED trigger for HC5861.
* Disable unused usbphy for HC5661, HC5661A and HC581B.
* Add switch port map properties based on 02_network scripts.
* Move aliases node to device dts because the LED nodes it
  references only exist in the device specific dts.
* Rename gpio-leds nodes to follow the upstream dt-bindings
  suggested pattern "(^led-[0-9a-f]$|led)".
* Convert deprecated LED label property to color and function.
  "system" LED has been renamed to "status", it is acceptable
  because these LEDs do not have text labels.

Signed-off-by: Shiji Yang <yangshiji66@outlook.com>
Link: https://github.com/openwrt/openwrt/pull/18251
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>