Make origin argument to tools/cherry-pick.py an option

Change-Id: Iae9d38db17625c366332dc03c82aa4482d295f07
diff --git a/tools/cherry-pick.py b/tools/cherry-pick.py
index fbc7bd2..4a9bca0 100755
--- a/tools/cherry-pick.py
+++ b/tools/cherry-pick.py
@@ -32,7 +32,7 @@
                         metavar='<hash>',
                         nargs='+',
                         help='Hashed to merge')
-    parser.add_argument('remote',
+    parser.add_argument('--remote',
                         default='origin',
                         help='The remote name (defaults to "origin")')
     return parser.parse_args()