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radeonsi/vcn: add support of HDR meta data in AV1 encoder

Ruijing Dong requested to merge rdong/mesa-rdong-2021:av1_hdr_meta into main

What does this MR do and why?

radeonsi/vcn: add support of HDR meta data in AV1 encoder

Add HDR meta data support in AV1 encoder, when the source
contains MDCV(mastering display color volume) or CLL (content
light level), when doing transcoding/encoding, these
HDR MDCV and CLL information can be transferred to av1 bitstream
as meta data.

Signed-off-by: Ruijing Dong <ruijing.dong@amd.com>

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