PCI: vmd: Remove dma_map_ops overrides

Devices on the VMD domain use the VMD endpoint's requester ID and have been
relying on the VMD endpoint's DMA operations.  The problem with this was
that VMD domain devices would use the VMD endpoint's attributes when doing
DMA and IOMMU mapping.  We can be smarter about this by only using the VMD
endpoint when mapping and providing the correct child device's attributes
during DMA operations.

Remove the dma_map_ops redirect.

Link: https://lore.kernel.org/r/1579613871-301529-7-git-send-email-jonathan.derrick@intel.com


Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>