Fix missing file name in changelog

The wrong generated file is referred to as having been missing in the
changelog entry for 3.2.1.

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
diff --git a/ChangeLog b/ChangeLog
index 6dfb23f..417c18e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,7 +3,7 @@
 = Mbed TLS 3.2.1 branch released 2022-07-12
 
 Bugfix
-   *  Re-add missing generated file library/ssl_debug_helpers_generated.c
+   *  Re-add missing generated file library/psa_crypto_driver_wrappers.c
 
 = Mbed TLS 3.2.0 branch released 2022-07-11