Plane: reduced the rate of EKF and attitude logging to 25Hz

this will reduce the log file size while not appreciably reducing the
ability to analyse logs

ArduPlane/ArduPlane.cpp

@@ -74,6 +74,7 @@ const AP_Scheduler::Task Plane::scheduler_tasks[] = {
     SCHED_TASK(update_trigger,         50,    100),
     SCHED_TASK(log_perf_info,         0.2,    100),
     SCHED_TASK(compass_save,        0.016,    200),
+    SCHED_TASK(Log_Write_Attitude,     25,    300),
     SCHED_TASK(update_logging1,        10,    300),
     SCHED_TASK(update_logging2,        10,    300),
     SCHED_TASK(parachute_check,        10,    200),
@@ -158,10 +159,6 @@ void Plane::ahrs_update()
 
     ahrs.update();
 
-    if (should_log(MASK_LOG_ATTITUDE_FAST)) {
-        Log_Write_Attitude();
-    }
-
     if (should_log(MASK_LOG_IMU)) {
         Log_Write_IMU();
         DataFlash.Log_Write_IMUDT(ins);

ArduPlane/Log.cpp

@@ -158,6 +158,9 @@ void Plane::do_erase_logs(void)
 // Write an attitude packet
 void Plane::Log_Write_Attitude(void)
 {
+    if (!should_log(MASK_LOG_ATTITUDE_FAST)) {
+        return;
+    }
     Vector3f targets;       // Package up the targets into a vector for commonality with Copter usage of Log_Wrote_Attitude
     targets.x = nav_roll_cd;
     targets.y = nav_pitch_cd;