java_gen: value types: add NO_MASK, FULL_MASK constants where missing

This is necessary so types can distinguish non-canonical forms.
diff --git a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/OFBitMask128.java b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/OFBitMask128.java
index 5cec233..051d573 100644
--- a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/OFBitMask128.java
+++ b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/OFBitMask128.java
@@ -14,6 +14,9 @@
     public static final OFBitMask128 ALL = new OFBitMask128(-1, -1);
     public static final OFBitMask128 NONE = new OFBitMask128(0, 0);
 
+    public static final OFBitMask128 NO_MASK = ALL;
+    public static final OFBitMask128 FULL_MASK = NONE;
+
     private OFBitMask128(long raw1, long raw2) {
         this.raw1 = raw1;
         this.raw2 = raw2;