iommu/vt-d: Pass dmar_domain directly into iommu_flush_iotlb_psi

This function can figure out the domain-id to use itself
from the iommu_did array. This is more reliable over
different domain types and brings us one step further to
remove the domain->id field.

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