iommufd: Add three missing structures in ucmd_buffer

iommufd: Add three missing structures in ucmd_buffer

struct iommu_ioas_copy, struct iommu_option and struct iommu_vfio_ioas are
missed in ucmd_buffer. Although they are smaller than the size of
ucmd_buffer, it is safer to list them in ucmd_buffer explicitly.

Fixes: aad37e71d5c4 ("iommufd: IOCTLs for the io_pagetable")
Fixes: d624d6652a65 ("iommufd: vfio container FD ioctl compatibility")
Link: https://lore.kernel.org/r/20230120122040.280219-1-yi.l.liu@intel.com
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>