obs-qsv11: Remove Intel NDA from qsv11 plugin

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Intel committed an NDA disclaimer on each source file.  The stated
intention was that the NDA "added to OBS doesn't apply to open source
code once it's been accepted by the community. You can remove it for
your modifications".  This quote is from an email chain involving
Intel's legal team and developers.  The NDA in the source files
mistakenly triggers source code scanners that look for license
violations.  I have removed the comments that contain the NDA.

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