Introduce a simplest iova tree implementation based on GTree.

CC: QEMU Stable <qemu-stable@nongnu.org>
Signed-off-by: NPeter Xu <peterx@redhat.com>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>