Polatis: add attenuation support

Change-Id: I1dbbccabf7ab11ced88019067a7eda1a0912a8c2
diff --git a/drivers/polatis/netconf/src/main/java/org/onosproject/drivers/polatis/netconf/PolatisOpticalUtility.java b/drivers/polatis/netconf/src/main/java/org/onosproject/drivers/polatis/netconf/PolatisOpticalUtility.java
index bac9f63..fe1b67b 100644
--- a/drivers/polatis/netconf/src/main/java/org/onosproject/drivers/polatis/netconf/PolatisOpticalUtility.java
+++ b/drivers/polatis/netconf/src/main/java/org/onosproject/drivers/polatis/netconf/PolatisOpticalUtility.java
@@ -50,6 +50,7 @@
     private static final int DEFAULT_PRIORITY = 88;
     private static final String DEFAULT_APP = "org.onosproject.drivers.polatis.netconf";
     public static final int POWER_MULTIPLIER = 100;
+    public static final int VOA_MULTIPLIER = 100;
     public static final Range<Long> POWER_RANGE = Range.closed(-6000L, 2800L);
 
     private PolatisOpticalUtility() {