libs: h265: dec: Add extension flags setting.
Use VAPictureParameterBufferHEVCExtension& VASliceParameterBufferHEVCExtension to pass extension setting from some extension profile clips which may include these information.
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Use VAPictureParameterBufferHEVCExtension& VASliceParameterBufferHEVCExtension to pass extension setting from some extension profile clips which may include these information.