Elon Musk says that Tesla is getting closer to integrating Valve’s Steam to take its in-car gaming platform to a whole new level. We know that Tesla has been investing heavily into integrating video games into its in-car entertainment system, but it still surprised many when Tesla said earlier this year that it planned to go as far as integrating Valve’s Steam, an online video game store and distribution platform, in its vehicles. It would result in a massive increase in games playable inside Tesla vehicles. This week, CEO Elon Musk said that Tesla is getting closer to achieving the Steam integration and the automaker is aiming for a demonstration…