DataFlash: remove DataFlash.Log_Write_Message_P()

libraries/DataFlash/DataFlash.h

@@ -107,7 +107,6 @@ public:
     bool Log_Write_MavCmd(uint16_t cmd_total, const mavlink_mission_item_t& mav_cmd);
     void Log_Write_Radio(const mavlink_radio_t &packet);
     bool Log_Write_Message(const char *message);
-    bool Log_Write_Message_P(const prog_char_t *message);
     void Log_Write_Camera(const AP_AHRS &ahrs, const AP_GPS &gps, const Location &current_loc);
     void Log_Write_ESC(void);
     void Log_Write_Airspeed(AP_Airspeed &airspeed);

libraries/DataFlash/LogFile.cpp

@@ -1060,18 +1060,6 @@ bool DataFlash_Class::Log_Write_Message(const char *message)
     return WriteCriticalBlock(&pkt, sizeof(pkt));
 }
 
-// Write a text message to the log
-bool DataFlash_Class::Log_Write_Message_P(const prog_char_t *message)
-{
-    struct log_Message pkt = {
-        LOG_PACKET_HEADER_INIT(LOG_MESSAGE_MSG),
-        time_us : hal.scheduler->micros64(),
-        msg  : {}
-    };
-    strncpy(pkt.msg, message, sizeof(pkt.msg));
-    return WriteCriticalBlock(&pkt, sizeof(pkt));
-}
-
 // Write a POWR packet
 void DataFlash_Class::Log_Write_Power(void)
 {