vfio: VFIO_DEVICE_[AT|DE]TACH_IOMMUFD_PT support pasid

This extends the VFIO_DEVICE_[AT|DE]TACH_IOMMUFD_PT ioctls to attach/detach
a given pasid of a vfio device to/from an IOAS/HWPT.

Link: https://patch.msgid.link/r/20250321180143.8468-4-yi.l.liu@intel.com


Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>