Indicate if BIGTK has been set in STATUS output

The new "bigtk_set=1" entry in the control interface STATUS command
output indicates that a BIGTK has been successfully configured. This
shows that beacon protection has been enabled for the current
association.

Signed-off-by: Jouni Malinen <quic_jouni@quicinc.com>

wpa_supplicant/wpa_supplicant_i.h

@@ -1611,6 +1611,7 @@ struct wpa_supplicant {
 #endif /* CONFIG_NAN_USD */
 
 	bool ssid_verified;
+	bool bigtk_set;
 };