Rover: add EKF params to full param list

APMrover2/Parameters.h

@@ -61,6 +61,7 @@ public:
         //
         k_param_compass_enabled = 130,
         k_param_steering_learn, // unused
+        k_param_NavEKF,  // Extended Kalman Filter Inertial Navigation Group
 
         // 140: battery controls
         k_param_battery_monitoring = 140,   // deprecated, can be deleted

APMrover2/Parameters.pde

@@ -495,6 +495,12 @@ const AP_Param::Info var_info[] PROGMEM = {
     // @Path: ../libraries/AP_BoardConfig/AP_BoardConfig.cpp
     GOBJECT(BoardConfig,            "BRD_",       AP_BoardConfig),
 
+#if AP_AHRS_NAVEKF_AVAILABLE
+    // @Group: EKF_
+    // @Path: ../libraries/AP_NavEKF/AP_NavEKF.cpp
+    GOBJECTN(ahrs.get_NavEKF(), NavEKF, "EKF_", NavEKF),
+#endif
+
 	AP_VAREND
 };