[media] Documentation: devicetree: Update Samsung FIMC DT binding

This patch documents following updates of the Exynos4 SoC camera subsystem
devicetree binding:

 - addition of #clock-cells and clock-output-names properties to 'camera'
   node - these are now needed so the image sensor sub-devices can reference
   clocks provided by the camera host interface,
 - dropped a note about required clock-frequency properties at the
   image sensor nodes; the sensor devices can now control their clock
   explicitly through the clk API and there is no need to require this
   property in the camera host interface binding.

Signed-off-by: Sylwester Nawrocki <[email protected]>
Acked-by: Kyungmin Park <[email protected]>
Acked-by: Laurent Pinchart <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>

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