microblaze: pci_controller->arch_data really is a struct device_node *

we are follow powerpc change:
44ef339073f67d4abcc62ae52a5fbc069d7a4d29

Signed-off-by: Michal Simek <monstr@monstr.eu>
diff --git a/arch/microblaze/kernel/prom_parse.c b/arch/microblaze/kernel/prom_parse.c
index ae0352e..bf7e6c2 100644
--- a/arch/microblaze/kernel/prom_parse.c
+++ b/arch/microblaze/kernel/prom_parse.c
@@ -256,7 +256,7 @@
 		if (ppdev == NULL) {
 			struct pci_controller *host;
 			host = pci_bus_to_host(pdev->bus);
-			ppnode = host ? host->arch_data : NULL;
+			ppnode = host ? host->dn : NULL;
 			/* No node for host bridge ? give up */
 			if (ppnode == NULL)
 				return -EINVAL;