A new Xpeng P7 car is shown in the Xpeng Motors flagship store in a shopping mall. Xpeng P7 is one of the two popular models of Xpeng motors. Zhang Peng | LightRocket | Getty Images GUANGZHOU, China — Chinese electric car start-up Xpeng released updates for its semi-autonomous driving system as its looks to up its challenge to Tesla in China. Xpeng released XPILOT 3.5, the latest version of its advanced driver-assistance system, or ADAS. This refers to a driving software system with some autonomous features but where a driver is still required. With XPILOT 3.5, the company will...