APM_Control: updates for new AP_Param API

libraries/APM_Control/AP_PitchController.h

@@ -9,6 +9,10 @@
 
 class AP_PitchController {
 public:
+	AP_PitchController() { 
+		AP_Param::setup_object_defaults(this, var_info);
+	}
+
 	void set_ahrs(AP_AHRS *ahrs) { _ahrs = ahrs; }
 
 	int32_t get_servo_out(int32_t angle, float scaler = 1.0, bool stabilize = false);

libraries/APM_Control/AP_RollController.h

@@ -9,6 +9,10 @@
 
 class AP_RollController {
 public:
+	AP_RollController() { 
+		AP_Param::setup_object_defaults(this, var_info);
+	}
+
 	void set_ahrs(AP_AHRS *ahrs) { _ahrs = ahrs; }
 
 	int32_t get_servo_out(int32_t angle, float scaler=1.0, bool stabilize=false);

libraries/APM_Control/AP_YawController.h

@@ -9,6 +9,10 @@
 
 class AP_YawController {
 public:                      
+	AP_YawController() { 
+		AP_Param::setup_object_defaults(this, var_info);
+	}
+
 	void set_ahrs(AP_AHRS *ahrs) { 
 		_ahrs = ahrs; 
 		_ins = _ahrs->get_ins();