softap: Add wowlan_triggers=any parameter

New kernels in wiphy_suspend() will call cfg80211_leave_all()
that will eventually end up in cfg80211_stop_ap() unless
wowlan_triggers were set.

Bug: 17269024

Change-Id: I609d78f5bb573b4c6a9dae25a3b2a345499f6853
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>