nl80211: Simplify hapd_send_eapol() with monitor interface

nl80211: Simplify hapd_send_eapol() with monitor interface

Call nl80211_send_monitor() directly instead of going through
wpa_driver_nl80211_send_frame() for the case where monitor interface is
used for AP mode management purposes. drv->use_monitor has to be 1 in
this code path, so wpa_driver_nl80211_send_frame() was calling
nl80211_send_monitor() unconditionally for this code path and that extra
function call can be removed here to simplify the implementation.

Signed-off-by: Jouni Malinen <j@w1.fi>