AP_NavEKF2: Allow the GPS to be responsible for logging

libraries/AP_NavEKF2/AP_NavEKF2.cpp

@@ -596,10 +596,6 @@ void NavEKF2::check_log_write(void)
         AP::logger().Write_Compass(imuSampleTime_us);
         logging.log_compass = false;
     }
-    if (logging.log_gps) {
-        AP::logger().Write_GPS(AP::gps().primary_sensor(), imuSampleTime_us);
-        logging.log_gps = false;
-    }
     if (logging.log_baro) {
         AP::logger().Write_Baro(imuSampleTime_us);
         logging.log_baro = false;

libraries/AP_NavEKF2/AP_NavEKF2.h

@@ -457,7 +457,6 @@ private:
     struct {
         bool enabled:1;
         bool log_compass:1;
-        bool log_gps:1;
         bool log_baro:1;
         bool log_imu:1;
     } logging;

libraries/AP_NavEKF2/AP_NavEKF2_Measurements.cpp

@@ -600,8 +600,6 @@ void NavEKF2_core::readGpsData()
                 gpsNotAvailable = false;
             }
 
-            frontend->logging.log_gps = true;
-
         } else {
             // report GPS fix status
             gpsCheckStatus.bad_fix = true;