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Marking PReP (PowerPC Reference Platform) partition support as deprecated in ironic-python-agent. PReP partitions are used to boot ppc64* systems. POWER hardware is a small, specialized share of today's bare-metal deployments. This is more or less a litmus test on whether PReP support should be retired; highlighting the comment at: https://review.opendev.org/c/openstack/ironic-python-agent/+/958333?tab=comments&commentId=00ef1ecc_d1f149b9 Change-Id: I88081500f7f951ce3627944c2945d4cfbdbbf451 Signed-off-by: Afonne-CID <afonnepaulc@gmail.com>