Relaunch "Create CarHTMLViewer for car builds"

ag/14276507 got reverted because of a build error. The build error
was fixed by allowing CarHTMLViewer to be in /system partition.

Bug: 185951366
Test: lunch gsi_car_arm64 && make CarHTMLViewer
Test: manual test
Change-Id: I2c4729ab6352a6b06bdb9969c17ff3ee64ea3331
5 files changed