SPM: Shorten 'TFM_GET_CONTAINER_PTR'

Use 'TO_CONTAINER' instead, which is shorter and straight.

Change-Id: I7f669aeed386b34b12ffeb2b9554310dcaa24d55
Signed-off-by: Ken Liu <Ken.Liu@arm.com>
diff --git a/secure_fw/spm/cmsis_psa/spm_ipc.c b/secure_fw/spm/cmsis_psa/spm_ipc.c
index 432a5c9..b3fd61c 100644
--- a/secure_fw/spm/cmsis_psa/spm_ipc.c
+++ b/secure_fw/spm/cmsis_psa/spm_ipc.c
@@ -250,7 +250,7 @@
      * partition mask until no remaining message. Search may be optimized.
      */
     BI_LIST_FOR_EACH(node, head) {
-        tmp_msg = TFM_GET_CONTAINER_PTR(node, struct tfm_msg_body_t, msg_node);
+        tmp_msg = TO_CONTAINER(node, struct tfm_msg_body_t, msg_node);
         if (tmp_msg->service->service_db->signal == signal && msg) {
             return msg;
         } else if (tmp_msg->service->service_db->signal == signal) {
@@ -385,7 +385,7 @@
     struct tfm_core_thread_t *pth = tfm_core_thrd_get_curr();
     struct partition_t *partition;
 
-    partition = TFM_GET_CONTAINER_PTR(pth, struct partition_t, sp_thread);
+    partition = TO_CONTAINER(pth, struct partition_t, sp_thread);
 
     return partition;
 }
@@ -882,9 +882,9 @@
 
     if (pth_next != NULL && pth_curr != pth_next) {
 #if TFM_LVL != 1
-        p_next_partition = TFM_GET_CONTAINER_PTR(pth_next,
-                                                 struct partition_t,
-                                                 sp_thread);
+        p_next_partition = TO_CONTAINER(pth_next,
+                                        struct partition_t,
+                                        sp_thread);
         p_part_static = p_next_partition->p_static;
         if (p_part_static->flags & SPM_PART_FLAG_PSA_ROT) {
             is_privileged = TFM_PARTITION_PRIVILEGED_MODE;