iwlwifi: remove rts_threshold

We never use that member of struct iwl_priv.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>

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

@@ -1211,7 +1211,6 @@ struct iwl_priv {
 
 	/* context information */
 	u8 bssid[ETH_ALEN];
-	u16 rts_threshold;
 	u8 mac_addr[ETH_ALEN];
 
 	/*station table variables */