iommufd/fault: Remove iommufd_fault_domain_attach/detach/replace_dev()

iommufd/fault: Remove iommufd_fault_domain_attach/detach/replace_dev()

There are new attach/detach/replace helpers in device.c taking care of both
the attach_handle and the fault specific routines for iopf_enable/disable()
and auto response.

Clean up these redundant functions in the fault.c file.

Link: https://patch.msgid.link/r/3ca94625e9d78270d9a715fa0809414fddd57e58.1738645017.git.nicolinc@nvidia.com
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>