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.org


Signed-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>