dt-bindings: Add YAML bindings for NVENC and NVJPG

Add YAML device tree bindings for the Tegra NVENC and NVJPG Host1x
engines.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>