Registier Frequency to Kryo

Change-Id: I4e91c4f48197ed2aa46d6458e1f397eea3468b8f

@@ -210,6 +210,7 @@ public final class KryoNamespaces {
             .register(new Ip6AddressSerializer(), Ip6Address.class)
             .register(new MacAddressSerializer(), MacAddress.class)
             .register(VlanId.class)
+            .register(Frequency.class)
             .build();
 
     /**

@@ -343,6 +343,12 @@ public class KryoSerializerTest {
         testSerializable(new DefaultLinkResourceAllocations(request, allocations));
     }
 
+
+    @Test
+    public void testFrequency() {
+        testSerializedEquals(Frequency.ofGHz(100));
+    }
+
     @Test
     public void testLambdaConstraint() {
         testSerializable(new LambdaConstraint(Lambda.valueOf(1)));