The ath9k driver creates an ath9k LED by default. Instead of having a
non functional LED, configure it properly and remove the extra as it's
not needed.
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/18906
Signed-off-by: Robert Marko <robimarko@gmail.com>