repo: run codespell

Run codespell and replace known misspelling.

Signed-off-by: Nicola Mazzucato <nicola.mazzucato@arm.com>
Change-Id: I6bfcf67b27745c98059a433c929af637f9a02d8e
diff --git a/build_helper/build_helper_configs.py b/build_helper/build_helper_configs.py
index 81c35b5..1660675 100755
--- a/build_helper/build_helper_configs.py
+++ b/build_helper/build_helper_configs.py
@@ -1644,7 +1644,7 @@
 if __name__ == '__main__':
     import os
 
-    # Default behavior is to export refference config when called
+    # Default behavior is to export reference config when called
     _dir = os.getcwd()
     from utils import save_json
     for _cname, _cfg in _builtin_configs.items():