test: Drop unwanted option in event_dump.py

This option is not used. Drop it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/scripts/event_dump.py b/scripts/event_dump.py
index 6aadddf..d87823f 100755
--- a/scripts/event_dump.py
+++ b/scripts/event_dump.py
@@ -108,8 +108,6 @@
     parser.add_argument('elf', type=str, help='ELF file to decode')
     parser.add_argument('-e', '--endian', type=str, default='auto',
                         help='Big-endian image')
-    parser.add_argument('-t', '--test', action='store_true',
-                        help='Big-endian image')
     args = parser.parse_args(argv)
     show_event_spy_list(args.elf, args.endian)