dt-bindings: media: Convert OV5640 binding to a schema

The Omnivision OV5640 is supported by Linux thanks to its device tree
binding.

Now that we have the DT validation in place, let's convert the device
tree bindings for that driver over to a YAML schema.

Cc: linux-media@vger.kernel.org
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Steve Longerbeam <slongerbeam@gmail.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20211015072830.8580-1-maxime@cerno.tech


Signed-off-by: Rob Herring <robh@kernel.org>