Add properties to set the number of pre-created users for car.
Bug: 111451156 Bug: 132111956 Test: manual verification on automotive's reference implementation Merged-In: I94b6ddeb82d9d5d2923dcca5ae4f3de56985a7a6 Change-Id: I94b6ddeb82d9d5d2923dcca5ae4f3de56985a7a6 (cherry picked from commit 7561a3bae48f361580423830464ba384b820d1fa)
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