Tegra: platform specific GIC sources

The TEGRA_GICv2_SOURCES contains the list of GIC sources required
to compile the GICv2 support for platforms.

This patch includes the TEGRA_GICv2_SOURCES macro from individual
makefiles to allow future platforms to use suport for GICv3.

Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
Change-Id: I429b1a0c7764ab370675f873a50cecda871110cb
diff --git a/plat/nvidia/tegra/soc/t132/platform_t132.mk b/plat/nvidia/tegra/soc/t132/platform_t132.mk
index 3d76be9..9534c07 100644
--- a/plat/nvidia/tegra/soc/t132/platform_t132.mk
+++ b/plat/nvidia/tegra/soc/t132/platform_t132.mk
@@ -23,11 +23,12 @@
 # platform files
 PLAT_INCLUDES		+=	-Iplat/nvidia/tegra/include/t132
 
-BL31_SOURCES		+=	drivers/ti/uart/aarch64/16550_console.S		\
+BL31_SOURCES		+=	${TEGRA_GICv2_SOURCES}			\
+				drivers/ti/uart/aarch64/16550_console.S	\
 				lib/cpus/aarch64/denver.S		\
 				${TEGRA_DRIVERS}/flowctrl/flowctrl.c	\
 				${TEGRA_DRIVERS}/memctrl/memctrl_v1.c	\
-				${TEGRA_DRIVERS}/pmc/pmc.c			\
+				${TEGRA_DRIVERS}/pmc/pmc.c		\
 				${SOC_DIR}/plat_psci_handlers.c		\
 				${SOC_DIR}/plat_sip_calls.c		\
 				${SOC_DIR}/plat_setup.c			\