Add a schema description for the venus video encoder/decoder on the sc7280. Signed-off-by: Dikshita Agarwal <dikshita@codeaurora.org> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>