ACPICA: Add post-order callback to acpi_walk_namespace

The existing interface only has a pre-order callback. This change
adds an additional parameter for a post-order callback which will
be more useful for bus scans. ACPICA BZ 779.

Also update the external calls to acpi_walk_namespace.

http://www.acpica.org/bugzilla/show_bug.cgi?id=779

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/acpica/evregion.c b/drivers/acpi/acpica/evregion.c
index c9fa040..582b0af 100644
--- a/drivers/acpi/acpica/evregion.c
+++ b/drivers/acpi/acpica/evregion.c
@@ -1025,8 +1025,8 @@
 	 */
 	status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
 					ACPI_NS_WALK_UNLOCK,
-					acpi_ev_install_handler, handler_obj,
-					NULL);
+					acpi_ev_install_handler, NULL,
+					handler_obj, NULL);
 
       unlock_and_exit:
 	return_ACPI_STATUS(status);
@@ -1062,7 +1062,7 @@
 	 */
 	status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
 					ACPI_NS_WALK_UNLOCK, acpi_ev_reg_run,
-					&space_id, NULL);
+					NULL, &space_id, NULL);
 
 	return_ACPI_STATUS(status);
 }