Allow properties from video-interface-devices.yaml for the SK Hynix Hi-846
sensor.

All properties specified in video-interface-devices.yaml schema are
valid, so make them accepted by changing "additionalProperties: false"
to "unevaluatedProperties: false" at the schema top-level.

Add two properties from video-interface-devices.yaml to the example
to validate the new schema.
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>