Restructure test-ref-configs to test with USE_PSA_CRYPTO turned on

Run some of the test configs twice, enabling MBEDTLS_USE_PSA_CRYPTO
and MBEDTLS_PSA_CRYPTO_C in one of the runs.
Add relevant comments in these configs.
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
diff --git a/configs/config-ccm-psk-tls1_2.h b/configs/config-ccm-psk-tls1_2.h
index c58d150..cbebf8c 100644
--- a/configs/config-ccm-psk-tls1_2.h
+++ b/configs/config-ccm-psk-tls1_2.h
@@ -81,6 +81,11 @@
  */
 #define MBEDTLS_SSL_MAX_CONTENT_LEN             1024
 
+/* These defines are present so that the config modifying scripts can enable
+ * them during tests/scripts/test-ref-configs.pl */
+//#define MBEDTLS_USE_PSA_CRYPTO
+//#define MBEDTLS_PSA_CRYPTO_C
+
 #include "mbedtls/check_config.h"
 
 #endif /* MBEDTLS_CONFIG_H */