PositionControl: replace interfacemapping checks

Removing the skip_controller and interfaceMapping
concept and replacing it with a single method checking
if the position control update was successful and
return the result in the PositionControl.update().

src/modules/mc_pos_control/PositionControl/ControlMath.cpp

@@ -159,7 +159,6 @@ Vector2f constrainXY(const Vector2f &v0, const Vector2f &v1, const float &max)
 		// notes:
 		// 	- s (=scaling factor) needs to be positive
 		// 	- (max - ||v||) always larger than zero, otherwise it never entered this if-statement
-
 		Vector2f u1 = v1.normalized();
 		float m = u1.dot(v0);
 		float c = v0.dot(v0) - max * max;