Tegra: include platform headers from individual makefiles

This patch modifies PLAT_INCLUDES to include individual Tegra SoC
headers from the platform's makefile.

Change-Id: If5248667f4e58ac18727d37a18fbba8e53f2d7b5
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
diff --git a/plat/nvidia/tegra/soc/t132/platform_t132.mk b/plat/nvidia/tegra/soc/t132/platform_t132.mk
index 183e188..16bd0ea 100644
--- a/plat/nvidia/tegra/soc/t132/platform_t132.mk
+++ b/plat/nvidia/tegra/soc/t132/platform_t132.mk
@@ -20,6 +20,9 @@
 MAX_MMAP_REGIONS		:= 8
 $(eval $(call add_define,MAX_MMAP_REGIONS))
 
+# platform files
+PLAT_INCLUDES		+=	-Iplat/nvidia/tegra/include/t132
+
 BL31_SOURCES		+=	drivers/ti/uart/aarch64/16550_console.S		\
 				lib/cpus/aarch64/denver.S		\
 				${COMMON_DIR}/drivers/flowctrl/flowctrl.c	\