Merge "Allow enabling and disable car mode from the shell." into tm-dev am: 1fbb452d

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18600317



Change-Id: I0fcf6a6d3c1252bf36e9c14bc1a13d0ce0abb594
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>