Copter: allow override of default frame type

ArduCopter/Parameters.cpp

@@ -364,7 +364,7 @@ const AP_Param::Info Copter::var_info[] = {
     // @Values: 0:Plus, 1:X, 2:V, 3:H, 4:V-Tail, 5:A-Tail, 10:Y6B, 11:Y6F, 12:BetaFlightX, 13:DJIX, 14:ClockwiseX
     // @User: Standard
     // @RebootRequired: True
-    GSCALAR(frame_type, "FRAME_TYPE", AP_Motors::MOTOR_FRAME_TYPE_X),
+    GSCALAR(frame_type, "FRAME_TYPE", HAL_FRAME_TYPE_DEFAULT),
 
     // @Group: ARMING_
     // @Path: ../libraries/AP_Arming/AP_Arming.cpp

ArduCopter/config.h

@@ -744,3 +744,7 @@
 #ifndef OSD_ENABLED
  #define OSD_ENABLED DISABLED
 #endif
+
+#ifndef HAL_FRAME_TYPE_DEFAULT
+#define HAL_FRAME_TYPE_DEFAULT AP_Motors::MOTOR_FRAME_TYPE_X
+#endif