Add mono_chrome to VAEncSequenceParameterBufferAV1
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Description
To chroma subsampling completely, it is required to set mono_chrome.
See https://aomediacodec.github.io/av1-spec/#color-config-semantics
In fact, [VADecPictureParameterBufferAV1](https://github.com/intel/libva/blob/97cbc87c94351c62a47d87e776488a9317ad398b/va/va_dec_av1.h#L281) has mono_chrome variable, but VAEncSequenceParameterBufferAV1 doesn't have.
It is necessary to add mono_chrome to VAEncSequenceParameterBufferAV1.
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