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

drivers/iommu/intel/dmar.c

@@ -380,7 +380,7 @@ dmar_find_dmaru(struct acpi_dmar_hardware_unit *drhd)
 	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