Prediction: added prediction conf file for navi mode

modules/prediction/conf/prediction_navi.conf

+--flagfile=modules/common/data/global_flagfile.txt
+--prediction_conf_file=modules/prediction/conf/prediction_navi_conf.pb.txt
+
+--enable_adjust_velocity_heading
+--noenable_kf_tracking
+--noprediction_offline_mode
+
+--enable_trim_prediction_trajectory
+--lane_change_dist=50.0
+
+--distance_beyond_junction=0.5
+--heading_filter_param=0.98
\ No newline at end of file