ACPI/IORT: Provide a generic helper to retrieve reserve regions

Currently IORT provides a helper to retrieve HW MSI reserve regions.
Change this to a generic helper to retrieve any IORT related reserve
regions. This will be useful when we add support for RMR nodes in
subsequent patches.

[Lorenzo: For ACPI IORT]

Reviewed-by: Lorenzo Pieralisi <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Tested-by: Steven Price <[email protected]>
Tested-by: Laurentiu Tudor <[email protected]>
Tested-by: Hanjun Guo <[email protected]>
Reviewed-by: Hanjun Guo <[email protected]>
Signed-off-by: Shameer Kolothum <[email protected]>
Acked-by: Robin Murphy <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Joerg Roedel <[email protected]>

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