Change mac80211 LED trigger code to use the generic
led_trigger_blink_oneshot() API for transmit and receive activity
indication.

This gives a better feedback to the user, as with the new API each
activity event results in a visible blink, while a constant traffic
results in a continuous blink at constant rate.
Signed-off-by: NFabio Baltieri <fabio.baltieri@gmail.com>
[fix LED disabled build error]
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>