SSL: use MD_CAN macros

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/library/ssl_cookie.c b/library/ssl_cookie.c
index ef4d188..82b7ea3 100644
--- a/library/ssl_cookie.c
+++ b/library/ssl_cookie.c
@@ -47,11 +47,11 @@
  * If DTLS is in use, then at least one of SHA-256 or SHA-384 is
  * available. Try SHA-256 first as 384 wastes resources
  */
-#if defined(MBEDTLS_HAS_ALG_SHA_256_VIA_LOWLEVEL_OR_PSA)
+#if defined(MBEDTLS_MD_CAN_SHA256)
 #define COOKIE_MD           MBEDTLS_MD_SHA256
 #define COOKIE_MD_OUTLEN    32
 #define COOKIE_HMAC_LEN     28
-#elif defined(MBEDTLS_HAS_ALG_SHA_384_VIA_LOWLEVEL_OR_PSA)
+#elif defined(MBEDTLS_MD_CAN_SHA384)
 #define COOKIE_MD           MBEDTLS_MD_SHA384
 #define COOKIE_MD_OUTLEN    48
 #define COOKIE_HMAC_LEN     28