added missing files for engineering mode generic vehicle 12t

Generic Vehicles/Engineering Mode/12t Delivery Truck/LAC-DF-Vdrop.csv

+v_drop [km/h], decision_factor [-]
+-100          , 1
+9             , 1
+11            , 0
+100           , 0
\ No newline at end of file

Generic Vehicles/Engineering Mode/12t Delivery Truck/LAC-DF-Vtarget.csv

+v_target [km/h], decision_factor [-]
+0              , 0
+48             , 0
+52             , 1
+100            , 1
\ No newline at end of file