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 <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Joerg Roedel <[e-mail]>

drivers/iommu/intel/dmar.c

···
 	return NULL;
 }
 
-/**
+/*
  * dmar_parse_one_drhd - parses exactly one DMA remapping hardware definition
  * structure which uniquely represent one DMA remapping hardware unit
  * present in the platform