Remove unused imports in list_internal_identifiers.py

Signed-off-by: Yuto Takano <yuto.takano@arm.com>
diff --git a/tests/scripts/list_internal_identifiers.py b/tests/scripts/list_internal_identifiers.py
index d1b5513..779a16f 100755
--- a/tests/scripts/list_internal_identifiers.py
+++ b/tests/scripts/list_internal_identifiers.py
@@ -30,8 +30,6 @@
 
 import argparse
 import logging
-import traceback
-import sys
 from check_names import CodeParser
 
 def main():