mac80211: Support multiple VIFS per AP in debugfs.

Create 'stations' sub-directory under each netdev:[vif-name]
directory to hold all stations for that network device.

Signed-off-by: Ben Greear <greearb@candelatech.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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

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

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

diff --cc net/mac80211/ieee80211_i.h
Simple merge