To fix migration between 2.7 and 2.8, some fields have
been renamed and managed with the help of a PHB property
(pre_2_8_migration):

    5c4537bd spapr: Fix 2.7<->2.8 migration of PCI host bridge

So we need to add them to the white list:

    dma_liobn[0],
    mem_win_addr, mem_win_size,
    io_win_addr, io_win_size

become

    mig_liobn,
    mig_mem_win_addr, mig_mem_win_size,
    mig_io_win_addr, mig_io_win_size

CC: David Gibson <david@gibson.dropbear.id.au>
CC: Dr. David Alan Gilbert <dgilbert@redhat.com>
CC: Thomas Huth <thuth@redhat.com>
CC: Greg Kurz <groug@kaod.org>
CC: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: NLaurent Vivier <lvivier@redhat.com>
Message-Id: <20170214133331.28997-1-lvivier@redhat.com>
Reviewed-by: NThomas Huth <thuth@redhat.com>
Reviewed-by: NDavid Gibson <david@gibson.dropbear.id.au>
Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com>