libpdbg/device: Add new targets in the order of traversal
libpdbg/device: Add new targets in the order of traversal

This automatically sorts targets in increasing index order.

Signed-off-by: Amitay Isaacs <a505e7c038746dbeb3edcd8d146dbd515432801f@ozlabs.org>

open-power/pdbg,open-power/pdbg,open-power/pdbg