Add mbedtls_ssl_session_set_alpn() function

Signed-off-by: Waleed Elmelegy <waleed.elmelegy@arm.com>
diff --git a/tests/suites/test_suite_ssl.function b/tests/suites/test_suite_ssl.function
index da07f2c..e29667d 100644
--- a/tests/suites/test_suite_ssl.function
+++ b/tests/suites/test_suite_ssl.function
@@ -2106,11 +2106,10 @@
             original.max_early_data_size == restored.max_early_data_size);
 #if defined(MBEDTLS_SSL_ALPN) && defined(MBEDTLS_SSL_SRV_C)
         if (endpoint_type == MBEDTLS_SSL_IS_SERVER) {
-            TEST_ASSERT(original.alpn != NULL);
-            TEST_ASSERT(restored.alpn != NULL);
-            TEST_ASSERT(memcmp(original.alpn,
-                               restored.alpn,
-                               strlen(original.alpn)) == 0);
+            TEST_ASSERT(original.ticket_alpn != NULL);
+            TEST_ASSERT(restored.ticket_alpn != NULL);
+            TEST_MEMORY_COMPARE(original.ticket_alpn, strlen(original.ticket_alpn),
+                                restored.ticket_alpn, strlen(restored.ticket_alpn));
         }
 #endif
 #endif