The StreamConfiguration class only implements toString() but doesn't
offer an overload of operator<<() which is more convenient to use.
Add an overload for operator<<(StreamConfiguration) and re-implement
StreamConfiguration::toString() on top of it.
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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