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nvdec: Add support 4:4:4 and 4:2:0 12bit decoding

Seungha Yang requested to merge seungha.yang/gst-plugins-bad:nvdec-more-format into master 
nvdec: Add support 4:4:4 and 4:2:0 12bit decoding

Depending on GPU architecture, HEVC decoder can support
4:4:4 format up to 12 bitdepth. This commit covers VP9 4:2:0 12 bits
decoding also.
nvenc: Add support for old drivers which could not understand SDK version 9.0

Add helper functions to support old drivers
with our previous SDK version 8.1
nvenc: Use consistent snake case convention
nvcodec: Bump SDK header to version 9.0

The latest Turing architecture (e.g., RTX serise) can support
decoding HEVC 4:4:4 format up to 12bits.

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