vfio: Fix typo of the device_state

A typo fix ("_RUNNNG" => "_RUNNING") in comment block of the uapi header.

Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Kirti Wankhede <kwankhede@nvidia.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>