ACPI: PCI: Remove unused struct 'acpi_handle_node'

'acpi_handle_node' is unused since 63f534b8 ("ACPI: PCI: Rework
acpi_get_pci_dev()"). Remove it.

Link: https://lore.kernel.org/r/20240509000858.204114-1-linux@treblig.orgSigned-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/acpi/pci_root.c

@@ -293,11 +293,6 @@ struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
 }
 EXPORT_SYMBOL_GPL(acpi_pci_find_root);
 
-struct acpi_handle_node {
-	struct list_head node;
-	acpi_handle handle;
-};
-
 /**
  * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev
  * @handle: the handle in question