AP_NavEKF3: set origin on all cores

when EKF origin is set, make sure it is set on all cores

libraries/AP_NavEKF3/AP_NavEKF3.cpp

@@ -1121,7 +1121,12 @@ bool NavEKF3::setOriginLLH(const Location &loc)
     if (!core) {
         return false;
     }
-    return core[primary].setOriginLLH(loc);
+    bool ret = false;
+    for (uint8_t i=0; i<num_cores; i++) {
+        ret |= core[i].setOriginLLH(loc);
+    }
+    // return true if any core accepts the new origin
+    return ret;
 }
 
 // return estimated height above ground level