Get cameras array from devices
Get cameras array from devices

Author: James Cameron <979be511e3d216882811a349af33a6d24f3f5f99@laptop.org>

[ported from multiple_cameras branch]
Signed-off-by: James Cameron <979be511e3d216882811a349af33a6d24f3f5f99@laptop.org>

godiard/record-activity