PCI: rpaphp: Correctly match ibm, my-drc-index to drc-name when using drc-info

The newer ibm,drc-info property is a condensed description of the old
ibm,drc-* properties (ie. names, types, indexes, and power-domains).
When matching a drc-index to a drc-name we need to verify that the
index is within the start and last drc-index range and map it to a
drc-name using the drc-name-prefix and logical index.

Fix the mapping by checking that the index is within the range of the
current drc-info entry, and build the name from the drc-name-prefix
concatenated with the starting drc-name-suffix value and the sequential
index obtained by subtracting ibm,my-drc-index from this entries
drc-start-index.

Signed-off-by: Tyrel Datwyler <[email protected]>
Acked-by: Bjorn Helgaas <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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