Add Oplink attenuation extension and channel power drivers.

Change-Id: I2558595b03cbb6cc58237dc48b8a03e83357fe1f
diff --git a/core/api/src/main/java/org/onosproject/net/flow/instructions/ExtensionTreatmentType.java b/core/api/src/main/java/org/onosproject/net/flow/instructions/ExtensionTreatmentType.java
index 9550597..a8df465 100644
--- a/core/api/src/main/java/org/onosproject/net/flow/instructions/ExtensionTreatmentType.java
+++ b/core/api/src/main/java/org/onosproject/net/flow/instructions/ExtensionTreatmentType.java
@@ -61,7 +61,8 @@
         NICIRA_ENCAP_ETH_SRC(121),
         NICIRA_ENCAP_ETH_DST(122),
         NICIRA_ENCAP_ETH_TYPE(123),
-        BMV2_ACTION(128);
+        BMV2_ACTION(128),
+        OPLINK_ATTENUATION(130);
 
         private ExtensionTreatmentType type;