spapr_pci: Reset DMA config on PHB reset
LoPAPR dictates that during system reset all DMA windows must be removed and the default DMA32 window must be created so does the patch. At the moment there is just one window supported so no change in behaviour is expected. Signed-off-by: NAlexey Kardashevskiy <aik@ozlabs.ru> Reviewed-by: NDavid Gibson <david@gibson.dropbear.id.au> Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
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