fix tls1_2 only sig_algs order issue

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index e6782bf..26fdf22 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -6588,12 +6588,12 @@
 /* NOTICE: see above */
 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
 static uint16_t ssl_tls12_preset_suiteb_sig_algs[] = {
-#if defined(MBEDTLS_SHA384_C)
-    MBEDTLS_SSL_SIG_ALG( MBEDTLS_SSL_HASH_SHA384 )
-#endif
 #if defined(MBEDTLS_SHA256_C)
     MBEDTLS_SSL_SIG_ALG( MBEDTLS_SSL_HASH_SHA256 )
 #endif
+#if defined(MBEDTLS_SHA384_C)
+    MBEDTLS_SSL_SIG_ALG( MBEDTLS_SSL_HASH_SHA384 )
+#endif
     MBEDTLS_TLS1_3_SIG_NONE
 };
 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */