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.py b/build_helper/build_helper.py
index 90ea832..3075fe7 100755
--- a/build_helper/build_helper.py
+++ b/build_helper/build_helper.py
@@ -89,7 +89,7 @@
                   user_args.config)
             sys.exit(1)
     else:
-        print("Error: Configuration not specificed")
+        print("Error: Configuration not specified")
         sys.exit(1)
 
     # Build everything