iommu/vt-d: Select PCI_ATS explicitly

The Intel VT-d implementation supports device TLB management. Select
PCI_ATS explicitly so that the pci_ats helpers are always available.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20210512065313.3441309-1-baolu.lu@linux.intel.com
Link: https://lore.kernel.org/r/20210610020115.1637656-5-baolu.lu@linux.intel.com


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