[media] dt-bindings: Add a binding for Video Data Order Adapter

Add a DT binding documentation for the Video Data Order Adapter (VDOA)
of the Freescale i.MX6 SoC.

Also, add the compatible property and correct clock to the device tree
to match the documentation.

Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>