cam: options: Add support for repeatable options

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>

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