scripts: cros_gdb: migrate --gdb_args to --gdb-args

BUG=None
TEST=CQ passes

Change-Id: Ib85b15ba032886b91755bbdd960ef52d0249fc3f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/4480693
Commit-Queue: Sergey Frolov <sfrolov@google.com>
Tested-by: Mike Frysinger <vapier@chromium.org>
Auto-Submit: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Sergey Frolov <sfrolov@google.com>
diff --git a/scripts/cros_gdb.py b/scripts/cros_gdb.py
index 47adfdd..9c1f098 100644
--- a/scripts/cros_gdb.py
+++ b/scripts/cros_gdb.py
@@ -651,12 +651,19 @@
     )
     parser.add_argument(
         "-g",
-        "--gdb_args",
+        "--gdb-args",
         action="append",
         default=[],
         help="Arguments to gdb itself.  If multiple arguments are"
         " passed, each argument needs a separate '-g' flag.",
     )
+    # TODO(build): Delete by Jan 2024.
+    parser.add_argument(
+        "--gdb_args",
+        action="append",
+        deprecated="Use --gdb-args instead",
+        help=argparse.SUPPRESS,
+    )
     parser.add_argument(
         "--remote",
         default=None,