Change the name of type ffa_vm_id_t

The type ffa_vm_id_t is used for all ffa_id variables not just
ones specific to vms so remove this element from the name to make
it simple ffa_id_t

Signed-off-by: Daniel Boulby <daniel.boulby@arm.com>
Change-Id: I29d751880c29b0a401cbc698f856c3651cc02789
diff --git a/spm/cactus/cactus_main.c b/spm/cactus/cactus_main.c
index ff3f618..cc2072c 100644
--- a/spm/cactus/cactus_main.c
+++ b/spm/cactus/cactus_main.c
@@ -34,7 +34,7 @@
 extern void secondary_cold_entry(void);
 
 /* Global ffa_id */
-ffa_vm_id_t g_ffa_id;
+ffa_id_t g_ffa_id;
 
 /*
  *
@@ -45,10 +45,10 @@
  *
  */
 
-static void __dead2 message_loop(ffa_vm_id_t vm_id, struct mailbox_buffers *mb)
+static void __dead2 message_loop(ffa_id_t vm_id, struct mailbox_buffers *mb)
 {
 	smc_ret_values ffa_ret;
-	ffa_vm_id_t destination;
+	ffa_id_t destination;
 
 	/*
 	* This initial wait call is necessary to inform SPMD that
@@ -182,7 +182,7 @@
 
 	/* Get current FFA id */
 	smc_ret_values ffa_id_ret = ffa_id_get();
-	ffa_vm_id_t ffa_id = (ffa_vm_id_t)(ffa_id_ret.ret2 & 0xffff);
+	ffa_id_t ffa_id = (ffa_id_t)(ffa_id_ret.ret2 & 0xffff);
 	if (ffa_func_id(ffa_id_ret) != FFA_SUCCESS_SMC32) {
 		ERROR("FFA_ID_GET failed.\n");
 		panic();