SPCI: SPCI_MSG_RECV.

Morph the existing vmapi api_mailbox_receive onto
api_spci_msg_recv.

Change-Id: Ie78f8985cfc55509fcd71eece22d6397b52d717d
diff --git a/test/hftest/hftest_service.c b/test/hftest/hftest_service.c
index 2a1b2a0..98c237b 100644
--- a/test/hftest/hftest_service.c
+++ b/test/hftest/hftest_service.c
@@ -91,7 +91,7 @@
 	hf_vm_configure(send_addr, recv_addr);
 
 	/* Receive the name of the service to run. */
-	hf_mailbox_receive(true);
+	spci_msg_recv(SPCI_MSG_RECV_BLOCK);
 	memiter_init(&args, recv_msg->payload, recv_msg->length);
 	service = find_service(&args);
 	hf_mailbox_clear();