Update DumpCL.java (#816)

Made the TAG String parameter to final since it is constant

Author: jineshfrancs

toolsAndroid/CLAnalyst/app/src/main/java/android/support/clanalyst/DumpCL.java

@@ -48,7 +48,7 @@
  * DumpCL.asString(cl) returns a json5 string
  */
 public class DumpCL {
-    private static String TAG = "ML_DEBUG";
+    private static final String TAG = "ML_DEBUG";
     HashMap<Integer, String> names = new HashMap<>();
 
     private DumpCL() {