The vivid kernel module emulates a v4l2 video devices like webcams. We
instantiate two devices via vivid to allow qt multimedia unit tests
requiring multiple cameras to run correctly.
Pick-to: 6.5 6.7 6.8
Change-Id: I1b87954e3c8af797f5b09dabf2d4939d8320db06
Reviewed-by: Artem Dyomin <artem.dyomin@qt.io>
Reviewed-by: Jøger Hansegård <joger.hansegard@qt.io>
