PCI: Add pci_resource_is_iov() to identify IOV resources

PCI: Add pci_resource_is_iov() to identify IOV resources

There are multiple places where special handling is required for IOV
resources.

Extract the identification of IOV resources to pci_resource_is_iov() and
drop a few ifdefs.

Link: https://lore.kernel.org/r/20241216175632.4175-9-ilpo.jarvinen@linux.intel.com
Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Tested-by: Xiaochun Lee <lixc17@lenovo.com>