lib: decoder: vp9: Set chroma_type by VP9 bit_depth
The decoder's surface chroma type should depend on the bit depth of VP9's parser. For 10bits VP9 stream, we need to use P10LE kind 10 bits surface as the decoder result.
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The decoder's surface chroma type should depend on the bit depth of VP9's parser. For 10bits VP9 stream, we need to use P10LE kind 10 bits surface as the decoder result.