media: dt-bindings: qcom-venus: Deprecate video-decoder and video-encoder where applicable

For the list of yaml files here the video-decoder and video-encoder nodes
provide nothing more than configuration input for the driver. These entries
do not in fact impart hardware specific data and should be deprecated.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Stanimir Varbanov <stanimir.k.varbanov@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>