SPM: Sort out tfm_secure_api.c file

- Rename 'tfm_utils.h' to 'utilities.h'.
- Rename 'tfm_spm_services_api.h'to 'tfm_spm_services.h'.
- Move 'tfm_secure_api.c' from spm/runtime to spm/model_func and
  sort out the content

Change-Id: Ie8831e2b1430eab6a2edc9b6c0487ef14f2fafc6
Signed-off-by: Summer Qin <summer.qin@arm.com>
diff --git a/secure_fw/spm/model_ipc/tfm_pools.c b/secure_fw/spm/model_ipc/tfm_pools.c
index 6ab56af..2fa3d40 100644
--- a/secure_fw/spm/model_ipc/tfm_pools.c
+++ b/secure_fw/spm/model_ipc/tfm_pools.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2019, Arm Limited. All rights reserved.
+ * Copyright (c) 2018-2020, Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  *
@@ -13,7 +13,7 @@
 #include "psa/service.h"
 #include "tfm_internal_defines.h"
 #include "cmsis_compiler.h"
-#include "tfm_utils.h"
+#include "utilities.h"
 #include "tfm_list.h"
 #include "tfm_pools.h"
 #include "tfm_memory_utils.h"