AP_NavEKF2: adjust for Location_Class and Location unification

libraries/AP_NavEKF2/AP_NavEKF2_core.cpp

@@ -220,7 +220,7 @@ void NavEKF2_core::InitialiseVariables()
     lastInnovPassTime_ms = 0;
     lastInnovFailTime_ms = 0;
     gpsAccuracyGood = false;
-    memset(&gpsloc_prev, 0, sizeof(gpsloc_prev));
+    gpsloc_prev = {};
     gpsDriftNE = 0.0f;
     gpsVertVelFilt = 0.0f;
     gpsHorizVelFilt = 0.0f;

libraries/AP_NavEKF2/AP_NavEKF2_core.h

@@ -25,6 +25,7 @@
 #define EK2_DISABLE_INTERRUPTS 0
 
 
+#include <AP_Common/Location.h>
 #include <AP_Math/AP_Math.h>
 #include "AP_NavEKF2.h"
 #include <stdio.h>