General Motors $GM ( ▲ 1.97% ) has reportedly forced a dealer to pull the plug on an aftermarket kit that retailers could install that restores phone-mirroring systems for Apple CarPlay and Android Auto in its Ultium-platform electric vehicles.  The details: GM contends that the upgrade kit—distributed by White Automotive & Media Services (WAMS)—could adversely affect “critical” vehicle functions and potentially stop working all together with software updates.   GM told LaFontaine Chevrolet in P...