iommu/vt-d: Drop kerneldoc marker from regular comment

Fix W=1 compile warnings (invalid kerneldoc):

    drivers/iommu/intel/dmar.c:389: warning: Function parameter or member 'header' not described in 'dmar_parse_one_drhd'

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20200728170859.28143-2-krzk@kernel.org


Signed-off-by: Joerg Roedel <jroedel@suse.de>