Added command line option "--platform-args".
This allows arguments to be passed to the platform config file for additional
processing.
diff --git a/tests/oft b/tests/oft
index a0244d5..01ca263 100755
--- a/tests/oft
+++ b/tests/oft
@@ -228,6 +228,7 @@
         remote:  Remote embedded Broadcom based switch
         Create a new_plat.py file and use --platform=new_plat on the command line
         """
+    parser.add_option("--platform-args", help="Custom arguments per platform.")
     parser.add_option("-P", "--platform", help=plat_help)
     parser.add_option("-H", "--host", dest="controller_host",
                       help="The IP/name of the test controller host")