Fix: add missing sections to dram in corstone-300

Change-Id: Ice51d9ab1ca828576b104b61bc86ed1918bdd878
diff --git a/targets/corstone-300/platform.scatter b/targets/corstone-300/platform.scatter
index e115c0f..55e21b7 100644
--- a/targets/corstone-300/platform.scatter
+++ b/targets/corstone-300/platform.scatter
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019-2021 Arm Limited. All rights reserved.
+ * Copyright (c) 2019-2022 Arm Limited.
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -214,6 +214,7 @@
         * (input_data_sec)
         * (expected_output_data_sec)
         * (output_data_sec)
+        * (sec_command_stream, sec_weight_data, sec_input_data)
     }
 
     #if (ETHOSU_ARENA == 1)