ath79: fix LED GPIOs for COMFAST CF-EW71 v2

ath79: fix LED GPIOs for COMFAST CF-EW71 v2

The vendor DTS defined incorrect GPIOs for the LEDs, which caused them
to not function properly. Initially, the WAN, WLAN LEDs appeared to
work, but further testing showed that they were non-functional.

This patch corrects the GPIO assignments in the DTS, restoring full LED
functionality including blinking, except the power LED which cannot be
software controlled.

Tested on a CF-EW71 v2 unit.

Fixes: ee3a6adc6c22 ("ath79: add support for Comfast CF-EW71 v2")
Signed-off-by: Felix Golatofski <git@xdfr.de>
Link: https://github.com/openwrt/openwrt/pull/19665
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>