library/tests: replace md_psa.h with psa_util.h as include file for MD conversion

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/library/ssl_ciphersuites.c b/library/ssl_ciphersuites.c
index 6224ef2..23619a2 100644
--- a/library/ssl_ciphersuites.c
+++ b/library/ssl_ciphersuites.c
@@ -17,7 +17,7 @@
 #include "mbedtls/ssl.h"
 #include "ssl_misc.h"
 #if defined(MBEDTLS_USE_PSA_CRYPTO)
-#include "md_psa.h"
+#include "mbedtls/psa_util.h"
 #endif
 
 #include <string.h>