powerpc/PCI: Use PCI_UNKNOWN for unknown power state

Previously we initialized dev->current_state to 4 (PCI_D3cold), but I think
we wanted PCI_UNKNOWN (5) here based on the comment and the fact that the
generic version of this code, pci_setup_device(), uses PCI_UNKNOWN.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/kernel/pci_of_scan.c

@@ -165,7 +165,7 @@ struct pci_dev *of_create_pci_dev(struct device_node *node,
 	pr_debug("    class: 0x%x\n", dev->class);
 	pr_debug("    revision: 0x%x\n", dev->revision);
 
-	dev->current_state = 4;		/* unknown power state */
+	dev->current_state = PCI_UNKNOWN;	/* unknown power state */
 	dev->error_state = pci_channel_io_normal;
 	dev->dma_mask = 0xffffffff;