media: venus: Populate video encoder/decoder nodename entries

Populate encoder and decoder node-name entries for the upstream parts. Once
done the compat="video-encoder" and compat="video-decoder" in the dtsi can
be dropped though the venus driver will continue to favour DT declared
video-encoder/video-decoder declarations over static declarations for
compatibility.

Tested-by: Renjiang Han <quic_renjiang@quicinc.com>
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>