vfio: Fold VFIO_GROUP_SET_CONTAINER into vfio_group_set_container()

No reason to split it up like this, just have one function to process the
ioctl. Move the lock into the function as well to avoid having a lockdep
annotation.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/6-v2-0f9e632d54fb+d6-vfio_ioctl_split_jgg@nvidia.com


Signed-off-by: Alex Williamson <alex.williamson@redhat.com>