spapr: Clean up DRC index construction
spapr_pci.c currently has several confusingly similarly named functions for various conversions between representations of DRCs. Make things clearer by renaming things in a more consistent XXX_from_YYY() manner and remove some called-only-once variants in favour of open coding. While we're at it, move this code together in the file to avoid some extra forward references, and split out construction and removal of DRCs for the host bridge into helper functions. Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au> Acked-by: NMichael S. Tsirkin <mst@redhat.com>
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