mac80211: optimise station flags

The flaglock in struct sta_info has long been
something that I wanted to get rid of, this
finally does the conversion to atomic bitops.

The conversion itself is straight-forward in
most places, a few things needed to change a
bit since we can no longer use multiple bits
at the same time.

On x86-64, this is a fairly significant code
size reduction:
   text	   data	    bss	    dec	    hex
 427861	  23648	   1008	 452517	  6e7a5	before
 425383	  23648	    976	 450007	  6ddd7	after

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --cc net/mac80211/agg-rx.c
Simple merge

diff --cc net/mac80211/agg-tx.c
Simple merge

diff --cc net/mac80211/cfg.c
Simple merge

diff --cc net/mac80211/debugfs_sta.c
Simple merge

diff --cc net/mac80211/ht.c
Simple merge

diff --cc net/mac80211/ibss.c
Simple merge

diff --cc net/mac80211/iface.c
Simple merge

diff --cc net/mac80211/key.c
Simple merge

diff --cc net/mac80211/mesh_plink.c
Simple merge

diff --cc net/mac80211/mlme.c
Simple merge

diff --cc net/mac80211/pm.c
Simple merge

diff --cc net/mac80211/rx.c
Simple merge

diff --cc net/mac80211/sta_info.c
Simple merge

diff --cc net/mac80211/sta_info.h
Simple merge

diff --cc net/mac80211/status.c
Simple merge

diff --cc net/mac80211/tx.c
Simple merge

diff --cc net/mac80211/util.c
Simple merge

diff --cc net/mac80211/wme.c
Simple merge