ACPI: export acpi_pci_root and friends
We can simplify ACPI drivers if we can tell whether a handle is an ACPI PCI root or not. Reviewed-by: NBjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: NAlex Chiang <achiang@hp.com> Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
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