AP_Logger: add times-full to MAV log structure

libraries/AP_Logger/LogStructure.h

@@ -362,6 +362,7 @@ struct PACKED log_MAV {
     uint16_t packet_rx_drop_count;
     uint8_t flags;
     uint16_t stream_slowdown_ms;
+    uint16_t times_full;
 };
 
 struct PACKED log_RSSI {
@@ -1662,6 +1663,7 @@ struct PACKED log_Arm_Disarm {
 // @Field: rxdp: perceived number of packets we never received
 // @Field: flags: compact representation of some stage of the channel
 // @Field: ss: stream slowdown is the number of ms being added to each message to fit within bandwidth
+// @Field: tf: times buffer was full when a message was going to be sent
 
 // @LoggerMessage: MAVC
 // @Description: MAVLink command we have just executed
@@ -2238,7 +2240,7 @@ struct PACKED log_Arm_Disarm {
     { LOG_RALLY_MSG, sizeof(log_Rally), \
       "RALY", "QBBLLh", "TimeUS,Tot,Seq,Lat,Lng,Alt", "s--DUm", "F--GGB" },  \
     { LOG_MAV_MSG, sizeof(log_MAV),   \
-      "MAV", "QBHHHBH",   "TimeUS,chan,txp,rxp,rxdp,flags,ss", "s#----s", "F-000-C" },   \
+      "MAV", "QBHHHBHH",   "TimeUS,chan,txp,rxp,rxdp,flags,ss,tf", "s#----s-", "F-000-C-" },   \
     { LOG_VISUALODOM_MSG, sizeof(log_VisualOdom), \
       "VISO", "Qffffffff", "TimeUS,dt,AngDX,AngDY,AngDZ,PosDX,PosDY,PosDZ,conf", "ssrrrmmm-", "FF000000-" }, \
     { LOG_VISUALPOS_MSG, sizeof(log_VisualPosition), \