Copter: split MSG_RAW_IMU1 into per-IMU ap_messages

ArduCopter/GCS_Mavlink.cpp

@@ -432,7 +432,9 @@ AP_GROUPEND
 };
 
 static const ap_message STREAM_RAW_SENSORS_msgs[] = {
-    MSG_RAW_IMU1,  // RAW_IMU, SCALED_IMU2, SCALED_IMU3
+    MSG_RAW_IMU,
+    MSG_SCALED_IMU2,
+    MSG_SCALED_IMU3,
     MSG_SCALED_PRESSURE,  // SCALED_PRESSURE, SCALED_PRESSURE2, SCALED_PRESSURE3
     MSG_SENSOR_OFFSETS
 };