mac80211: fixing ieee80211_bar types

This patch changes ieee80211_bar control and start_seq_num to
match the proper bitwise attribute expected from ieee 802.11 frame

Signed-off-by: Ron Rindjunsky <ron.rindjunsky@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>