Rivian is all-in on autonomous driving, stepping deeper into a territory Tesla has long positioned itself to dominate. On Thursday, at Rivian's R&D office in Palo Alto, the EV maker unveiled a road map to develop autonomous-driving capabilities for its future lineup of vehicles, including new hardware for the highly anticipated R2 — Rivian's cheapest car to date.That road map includes a new silicon chip, designed in-house, that will power Rivian's next-generation hardware and support self-driving functions ...