openflow_input: add of_oxm_bsn_in_ports_512

This requires support from the backends for the new datatype.
diff --git a/openflow_input/bsn_in_ports b/openflow_input/bsn_in_ports
index 819bdde..bb4c030 100644
--- a/openflow_input/bsn_in_ports
+++ b/openflow_input/bsn_in_ports
@@ -60,3 +60,14 @@
     of_bitmap_128_t value;
     of_bitmap_128_t value_mask;
 };
+
+struct of_oxm_bsn_in_ports_512 : of_oxm {
+    uint32_t type_len == 0x00032640;
+    of_bitmap_512_t value;
+};
+
+struct of_oxm_bsn_in_ports_512_masked : of_oxm {
+    uint32_t type_len == 0x00032780;
+    of_bitmap_512_t value;
+    of_bitmap_512_t value_mask;
+};