Add a flag to indicate if an option can be repeatable. If an option is repeatable it must be accessed thru the array interface, even if it's only specified once by the user. Also update the usage generator to indicate which options are repeatable. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>