ACPI/IORT: Remove the unused __get_pci_rid()

Since commit bc8648d49a95 ("ACPI/IORT: Handle PCI aliases properly for
IOMMUs"), __get_pci_rid() has become actually unused and can be removed.

Signed-off-by: Zenghui Yu <[e-mail]>
Acked-by: Lorenzo Pieralisi <[e-mail]>
Acked-by: Hanjun Guo <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Will Deacon <[e-mail]>

drivers/acpi/arm64/iort.c

···
 		dev_set_msi_domain(dev, msi_domain);
 }
 
-static int __maybe_unused __get_pci_rid(struct pci_dev *pdev, u16 alias,
-					void *data)
-{
-	u32 *rid = data;
-
-	*rid = alias;
-	return 0;
-}
-
 #ifdef CONFIG_IOMMU_API
 static struct acpi_iort_node *iort_get_msi_resv_iommu(struct device *dev)
 {