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-thread.h b/configs/config-thread.h
index 8464fcb..de24158 100644
--- a/configs/config-thread.h
+++ b/configs/config-thread.h
@@ -86,6 +86,11 @@
 /* Save ROM and a few bytes of RAM by specifying our own ciphersuite list */
 #define MBEDTLS_SSL_CIPHERSUITES MBEDTLS_TLS_ECJPAKE_WITH_AES_128_CCM_8
 
+/* 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 */