commit 12d423e8 upstream.

Instead of always calling ieee80211_beacon_loss() on every missed
beacons notification, call this function only if the number of
consecutive missed beacons from last rx is higher than a predefined
threshold.
Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Cc: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>