SPM: Rename 'thread call' with 'cross call'

Name "thread call" could not explicitly reflect the behaviour
of call type. This call crosses between caller and callee stack,
which enables caller and callee context to be sealed in their stack.

Rename this call with "cross call" to make the code more readable.
It will also benefit the upcoming optimization work.

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: I7d2de563b6f498bde70e302065e743344d2a20fc
diff --git a/secure_fw/spm/ffm/backend_ipc.c b/secure_fw/spm/ffm/backend_ipc.c
index 430848c..7dc2a22 100644
--- a/secure_fw/spm/ffm/backend_ipc.c
+++ b/secure_fw/spm/ffm/backend_ipc.c
@@ -23,7 +23,7 @@
 /* Declare the global component list */
 struct partition_head_t partition_listhead;
 
-#ifdef CONFIG_TFM_PSA_API_THREAD_CALL
+#ifdef CONFIG_TFM_PSA_API_CROSS_CALL
 
 #ifdef TFM_MULTI_CORE_TOPOLOGY
 /* TODO: To be checked when RPC design updates. */
@@ -119,7 +119,7 @@
     if (p_pldi->pid == TFM_SP_NON_SECURE_ID) {
         p_param = (void *)tfm_hal_get_ns_entry_point();
 
-#ifdef CONFIG_TFM_PSA_API_THREAD_CALL
+#ifdef CONFIG_TFM_PSA_API_CROSS_CALL
 #ifndef TFM_MULTI_CORE_TOPOLOGY
         SPM_THREAD_CONTEXT = &p_pt->ctx_ctrl;
 #endif