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Add pci_unmap_iospace() to undo what pci_remap_iospace() did. This is needed to support hotplug removal of host bridges that use pci_remap_iospace(). [bhelgaas: changelog] Signed-off-by: Sinan Kaya <okaya@codeaurora.org> Signed-off-by: Tomasz Nowicki <tn@semihalf.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>