Copter: remove dup definition of FRAME_ORIENTATION

Ideally the frame orientation parameter should be moved to the motors
class

ArduCopter/Parameters.pde

@@ -399,7 +399,7 @@ const AP_Param::Info var_info[] PROGMEM = {
     // @Description: Controls motor mixing for multicopters.  Not used for Tri or Traditional Helicopters.
     // @Values: 0:Plus, 1:X, 2:V, 3:H
     // @User: Standard
-    GSCALAR(frame_orientation, "FRAME",             FRAME_ORIENTATION),
+    GSCALAR(frame_orientation, "FRAME",             AP_MOTORS_X_FRAME),
 
     // @Param: CH7_OPT
     // @DisplayName: Channel 7 option

ArduCopter/config.h

@@ -100,9 +100,6 @@
 #ifndef FRAME_CONFIG
  # define FRAME_CONFIG   QUAD_FRAME
 #endif
-#ifndef FRAME_ORIENTATION
- # define FRAME_ORIENTATION      X_FRAME
-#endif
 
 /////////////////////////////////////////////////////////////////////////////////
 // TradHeli defaults

ArduCopter/defines.h

@@ -90,10 +90,6 @@
 #define OCTA_QUAD_FRAME 7
 #define SINGLE_FRAME 8
 
-#define PLUS_FRAME 0
-#define X_FRAME 1
-#define V_FRAME 2
-
 // Internal defines, don't edit and expect things to work
 // -------------------------------------------------------