feat(scheduled mode): wind call chain for FFA_MSG_SEND_DIRECT_REQ

This patch performs the action of winding the SP call chain upon
FFA_MSG_SEND_DIRECT_REQ invocation.

Change-Id: I139a8d0508d97841aaa8f26c8a1e7a0129901b5e
Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>
diff --git a/src/arch/fake/hypervisor/ffa.c b/src/arch/fake/hypervisor/ffa.c
index b5ea9ae..3a9e8dd 100644
--- a/src/arch/fake/hypervisor/ffa.c
+++ b/src/arch/fake/hypervisor/ffa.c
@@ -440,3 +440,12 @@
 
 	return true;
 }
+
+void plat_ffa_wind_call_chain_ffa_direct_req(
+	struct vcpu_locked current_locked,
+	struct vcpu_locked receiver_vcpu_locked)
+{
+	/* Calls chains not supported in the Hypervisor/VMs. */
+	(void)current_locked;
+	(void)receiver_vcpu_locked;
+}