ieee80211: support parsing Fine Timing Measurement action frame

Add definition for Fine Timing Measurement (FTM) frame format
as defined in IEEE802.11-REVmcD5.0 section 9.6.8.33

Signed-off-by: Avraham Stern <avraham.stern@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

include/linux/ieee80211.h

@@ -7,6 +7,7 @@
  * Copyright (c) 2005, Devicescape Software, Inc.
  * Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net>
  * Copyright (c) 2013 - 2014 Intel Mobile Communications GmbH
+ * Copyright (c) 2016 Intel Deutschland GmbH
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -1011,6 +1012,16 @@ struct ieee80211_mgmt {
 					u8 tpc_elem_length;
 					struct ieee80211_tpc_report_ie tpc;
 				} __packed tpc_report;
+				struct {
+					u8 action_code;
+					u8 dialog_token;
+					u8 follow_up;
+					u8 tod[6];
+					u8 toa[6];
+					__le16 tod_error;
+					__le16 toa_error;
+					u8 variable[0];
+				} __packed ftm;
 			} u;
 		} __packed action;
 	} u;