Rover: use DataFlash should_log to determine raw IMU logging

APMrover2/APMrover2.cpp

@@ -350,8 +350,6 @@ void Rover::one_second_loop(void)
         counter = 0;
     }
 
-    ins.set_raw_logging(should_log(MASK_LOG_IMU_RAW));
-
     // update home position if not soft armed and gps position has
     // changed. Update every 1s at most
     if (!hal.util->get_soft_armed() &&

APMrover2/system.cpp

@@ -165,6 +165,8 @@ void Rover::init_ardupilot()
 
     rc_override_active = hal.rcin->set_overrides(rc_override, 8);
 
+    ins.set_log_raw_bit(MASK_LOG_IMU_RAW);
+
     set_control_channels();
     init_rc_in();        // sets up rc channels from radio
     init_rc_out();        // sets up the timer libs
@@ -259,9 +261,6 @@ void Rover::startup_ground(void)
     // so set serial ports non-blocking once we are ready to drive
     serial_manager.set_blocking_writes_all(false);
 
-    ins.set_raw_logging(should_log(MASK_LOG_IMU_RAW));
-    ins.set_dataflash(&DataFlash);
-
     gcs_send_text(MAV_SEVERITY_INFO, "Ready to drive");
 }