Rover: changes for new AHRS API

APMrover2/Parameters.cpp

@@ -517,7 +517,7 @@ const AP_Param::Info Rover::var_info[] PROGMEM = {
 #if AP_AHRS_NAVEKF_AVAILABLE
     // @Group: EKF_
     // @Path: ../libraries/AP_NavEKF/AP_NavEKF.cpp
-    GOBJECTN(ahrs.get_NavEKF(), NavEKF, "EKF_", NavEKF),
+    GOBJECTN(EKF, NavEKF, "EKF_", NavEKF),
 #endif
 
     // @Group: MIS_

APMrover2/Rover.cpp

@@ -30,11 +30,6 @@ Rover::Rover(void) :
 #endif
     in_log_download(false),
     modes(&g.mode1),
-#if AP_AHRS_NAVEKF_AVAILABLE
-    ahrs(ins, barometer, gps, sonar),
-#else
-    ahrs(ins, barometer, gps),
-#endif
     L1_controller(ahrs),
     nav_controller(&L1_controller),
     steerController(ahrs),

APMrover2/Rover.h

@@ -158,9 +158,10 @@ private:
 
 // Inertial Navigation EKF
 #if AP_AHRS_NAVEKF_AVAILABLE
-    AP_AHRS_NavEKF ahrs;
+    NavEKF EKF{&ahrs, barometer, sonar};
+    AP_AHRS_NavEKF ahrs {ins, barometer, gps, sonar, EKF};
 #else
-    AP_AHRS_DCM ahrs;
+    AP_AHRS_DCM ahrs {ins, barometer, gps};
 #endif
 
     AP_L1_Control L1_controller;