Tegra: Exclude coherent memory region from memory map

This patch sets the 'USE_COHERENT_MEM' flag to '0', so that the
coherent memory region will not be included in the memory map.

Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
diff --git a/plat/nvidia/tegra/common/tegra_common.mk b/plat/nvidia/tegra/common/tegra_common.mk
index 73e1281..5ec52fb 100644
--- a/plat/nvidia/tegra/common/tegra_common.mk
+++ b/plat/nvidia/tegra/common/tegra_common.mk
@@ -34,6 +34,8 @@
 ASM_ASSERTION		:=	1
 $(eval $(call add_define,ASM_ASSERTION))
 
+USE_COHERENT_MEM	:=	0
+
 PLAT_INCLUDES		:=	-Iplat/nvidia/tegra/include/drivers \
 				-Iplat/nvidia/tegra/include \
 				-Iplat/nvidia/tegra/include/${TARGET_SOC}