Acloud: Keep acloud command-line arguments consistent.

Test: atest acloud_test && m acloud &&
      acloud create --help

Bug: 123067693
Change-Id: Ied6358a6e57649b22cb1975e60bf0e99b65d2725
diff --git a/setup/setup_args.py b/setup/setup_args.py
index dffb536..1ba34a0 100644
--- a/setup/setup_args.py
+++ b/setup/setup_args.py
@@ -40,7 +40,7 @@
         required=False,
         help="Setup host to run local instance of an Android Virtual Device.")
     setup_parser.add_argument(
-        "--gcp_init",
+        "--gcp-init",
         action="store_true",
         dest="gcp_init",
         required=False,