SST: Rename get_attributes APIs to get_info

This patch renames get_attributes functions to get_info, and updates
the SST code as follows:
- rename tfm_sst_attribs_t to tfm_sst_asset_info_t
- rename sst_asset_infoi_t to sst_asset_policy_t in
  sst_asset_management
- add sst_core_obj_info_t in sst_core
- update sst service APIs and code to accomodate it to the new types
  and type names
- update dependant tests to accomodate them to the new names

Change-Id: Ifa0e56c3c15c7de40d6af4aa3f96c8bd7eae85f2
Signed-off-by: Marc Moreno <marc.morenoberengue@arm.com>
diff --git a/interface/include/tfm_sst_api.h b/interface/include/tfm_sst_api.h
index 66865ac..d22653c 100644
--- a/interface/include/tfm_sst_api.h
+++ b/interface/include/tfm_sst_api.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017 - 2018, Arm Limited. All rights reserved.
+ * Copyright (c) 2017-2018, Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  *
@@ -40,16 +40,16 @@
 enum tfm_sst_err_t  tfm_sst_create(uint16_t asset_uuid);
 
 /**
- * \brief Gets asset's attributes referenced by asset handler.
- *        Uses cached metadata to return the size and write offset of an asset.
+ * \brief Gets asset's information referenced by asset handler.
  *
  * \param[in]  asset_handle   Asset handler
- * \param[out] attrib_struct  Pointer to store the asset's attribute
+ * \param[out] info           Pointer to store the asset's information
+ *                            \ref tfm_sst_asset_info_t
  *
  * \return Returns error code as specified in \ref tfm_sst_err_t
  */
-enum tfm_sst_err_t tfm_sst_get_attributes(uint32_t asset_handle,
-                                          struct tfm_sst_attribs_t* attrib_struct);
+enum tfm_sst_err_t tfm_sst_get_info(uint32_t asset_handle,
+                                    struct tfm_sst_asset_info_t *info);
 
 /**
  * \brief Reads asset's data from asset referenced by asset handler.