Refactor optional parameter check tests

Remove tests related to NULL pointers,
keep tests related to invalid enum values.
Remove test code related to MBEDTLS_CHECK_PARAMS.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
Signed-off-by: TRodziewicz <tomasz.rodziewicz@mobica.com>
diff --git a/tests/suites/test_suite_aes.rest.data b/tests/suites/test_suite_aes.rest.data
index 6a76b43..3b43c90 100644
--- a/tests/suites/test_suite_aes.rest.data
+++ b/tests/suites/test_suite_aes.rest.data
@@ -10,8 +10,8 @@
 AES-256-CBC Decrypt (Invalid input length)
 aes_decrypt_cbc:"0000000000000000000000000000000000000000000000000000000000000000":"00000000000000000000000000000000":"623a52fcea5d443e48d9181ab32c74":"":MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH
 
-AES - Optional Parameter Validation (MBEDTLS_CHECK_PARAMS)
-aes_check_params:
+AES - Mode Parameter Validation
+aes_invalid_mode:
 
 AES - Mandatory Parameter Validation and Valid Parameters
 aes_misc_params: