Replace `crypto engine` with `crypto extension`

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/include/mbedtls/mbedtls_config.h b/include/mbedtls/mbedtls_config.h
index 6cea050..3dea18c 100644
--- a/include/mbedtls/mbedtls_config.h
+++ b/include/mbedtls/mbedtls_config.h
@@ -2068,7 +2068,7 @@
 /**
  * \def MBEDTLS_AESCE_C
  *
- * Enable AES crypto engine support on Arm64.
+ * Enable AES crypto extension support on Arm64.
  *
  * Module:  library/aesce.c
  * Caller:  library/aes.c