Intel Corp.’s self-driving car unit, Mobileye, has confidentially filed paperwork for a U.S. IPO, Reuters reports. The IPO could value the Israeli unit at over $50 billion. Intel acquired Mobileye for $15.3 billion in 2017 to fire up rivalry with Nvidia Corp. and Qualcomm Inc. in developing driverless systems for automakers. Intel CEO Pat Gelsinger has been under pressure from activist…