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/evgpeblk.c b/drivers/acpi/acpica/evgpeblk.c
index a60aaa7..2479209 100644
--- a/drivers/acpi/acpica/evgpeblk.c
+++ b/drivers/acpi/acpica/evgpeblk.c
@@ -945,8 +945,8 @@
 
 	status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD, gpe_device,
 					ACPI_UINT32_MAX, ACPI_NS_WALK_NO_UNLOCK,
-					acpi_ev_save_method_info, gpe_block,
-					NULL);
+					acpi_ev_save_method_info, NULL,
+					gpe_block, NULL);
 
 	/* Return the new block */
 
@@ -1022,8 +1022,8 @@
 		status =
 		    acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
 					   ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
-					   acpi_ev_match_prw_and_gpe, &gpe_info,
-					   NULL);
+					   acpi_ev_match_prw_and_gpe, NULL,
+					   &gpe_info, NULL);
 	}
 
 	/*