iommu: Remove detach_dev callback

The detach_dev callback of domain ops is not called in the IOMMU core.
Remove this callback to avoid dead code. The trace event for detaching
domain from device is removed accordingly.

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20230110025408.667767-6-baolu.lu@linux.intel.com


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