Remove android.car.Car from the preloaded-classes-denylist.

This class is used by the CarService, which is a system service that is always running on Android Automotive devices, but not for phones.

Bug: 254051423
Bug: 377482680
Change-Id: I19bf0ce4dcf1b2b72e92a8f7b3064073e1d2d1dd
Test: m