iommu/vt-d: Convert to probe/release_device() call-backs

Convert the Intel IOMMU driver to use the probe_device() and
release_device() call-backs of iommu_ops, so that the iommu core code
does the group and sysfs setup.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20200429133712.31431-17-joro@8bytes.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>