juno: Add security sources for tsp-juno

Security sources are required if stack-protector is enabled.

Change-Id: Ia0071f60cf03d48b200fd1facbe50bd9e2f8f282
Signed-off-by: Louis Mayencourt <louis.mayencourt@arm.com>

plat/arm/board/juno/tsp/tsp-juno.mk

 #
-# Copyright (c) 2014-2016, ARM Limited and Contributors. All rights reserved.
+# Copyright (c) 2014-2019, ARM Limited and Contributors. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
 
 BL32_SOURCES		+=	plat/arm/board/juno/juno_topology.c	\
 				plat/arm/css/common/css_topology.c	\
-				${JUNO_GIC_SOURCES}
+				${JUNO_GIC_SOURCES}			\
+				${JUNO_SECURITY_SOURCES}
 
 include plat/arm/common/tsp/arm_tsp.mk