iwlwifi: remove ieee80211 types from iwl-helpers.h

This patch removes IEEE80211_STYPE_BACK_REQ and
IEEE80211_STYPE_BACK defines from iwl-helpers.h. These are already
defined in include/linux/ieee80211.h
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-helpers.h

@@ -147,9 +147,6 @@ static inline struct ieee80211_conf *ieee80211_get_hw_conf(
 
 #define QOS_CONTROL_LEN 2
 
-#define IEEE80211_STYPE_BACK_REQ	0x0080
-#define IEEE80211_STYPE_BACK		0x0090
-
 
 static inline int ieee80211_is_management(u16 fc)
 {