d3d11: Add support for packed 8bits 4:2:2 YUV formats

Note that newly added formats (YUY2, UYVY, and VYUY) are not supported render target view formats. So such formats can be only input of d3d11convert or d3d11videosink. Another note is that YUY2 format is a very common format for hardware en/decoders on Windows.

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