d3d12/va: Add HEVC 10 bits support and 8-10 bit color conversion
This MR adds support for HEVC 10 bit encoding and decoding with d3d12 and allows P010 in the d3d12 video processor for NV12<->P010 color conversion.
Two new VA entrypoints light up on GPUs supporting 10 bits HEVC.
vainfo: Supported profile and entrypoints
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VAProfileHEVCMain10 : VAEntrypointVLD
VAProfileHEVCMain10 : VAEntrypointEncSlice
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