copyright owner and author clean up for intel iommu and related files

The following is a clean up and correction of the copyright holding
entities for the files associated with the intel iommu code.

Signed-off-by:  <mgross@linux.intel.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>