Long snappers are in the game, but they play a multitude of positions, as they don't have their own position in the game. On one team they might be a offensive lineman, on a second team a defensive lineman or even as a tight end on a third team.
In the most recent released player ratings both Cox (Ravens' LS) and Harris (Bengals' LS) are in the roster. Cox is listed as a 50 OVR LE, while Harris is listed as a 59 OVR TE.
So yes, long snappers are in the game, but they are listed as expendable players at other positions. However, I've never, ever seen a missed or poor long snap in Madden, so why should I care who the long snapper is.