qcacld-3.0: Remove struct hdd_roaming_info::defer_key_complete

The following patch removed all usage of the defer_key_complete member
in struct hdd_roaming_info:
    qcacld-3.0: Remove unused code for defer key
    Change-Id I8afcebf00b00bcf39ba7da999c55e5eacdf26aaa

Since it is obsolete, remove it.

Change-Id: I4ed0eeba29ed74ddc82bf2a6723d73b49a9b907f
CRs-Fixed: 3424957

core/hdd/inc/wlan_hdd_main.h

@@ -607,16 +607,12 @@ struct hdd_stats {
  * @peer_mac: Peer MAC address for IBSS connection
  * @roam_id: Unique identifier for a roaming instance
  * @roam_status: Current roam command status
- * @defer_key_complete: Should key complete be deferred?
- *
  */
 struct hdd_roaming_info {
 	tSirMacAddr bssid;
 	tSirMacAddr peer_mac;
 	uint32_t roam_id;
 	eRoamCmdStatus roam_status;
-	bool defer_key_complete;
-
 };
 
 #ifdef FEATURE_WLAN_WAPI