binderThroughputTest: training option shouldn't have a payload

The training round doesn't have an argument payload so remove this from
the help menu.

Change-Id: I4e7f40727baba92c54fb66541b4068d5c33c1138
Signed-off-by: Carlos Llamas <cmllamas@google.com>
diff --git a/libs/binder/tests/binderThroughputTest.cpp b/libs/binder/tests/binderThroughputTest.cpp
index 248e1e5..0a5518e 100644
--- a/libs/binder/tests/binderThroughputTest.cpp
+++ b/libs/binder/tests/binderThroughputTest.cpp
@@ -346,7 +346,7 @@
             cout << "\t-m N    : Specify expected max latency in microseconds." << endl;
             cout << "\t-p      : Split workers into client/server pairs." << endl;
             cout << "\t-s N    : Specify payload size." << endl;
-            cout << "\t-t N    : Run training round." << endl;
+            cout << "\t-t      : Run training round." << endl;
             cout << "\t-w N    : Specify total number of workers." << endl;
             return 0;
         }