media: dt-bindings: media: amlogic,vdec: convert to yaml

Now that we have the DT validation in place, let's convert the device tree
bindings for the Amlogic Video Controller over to YAML schemas.

This yaml bindings will then be extended to support new SoCs.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>