Tegra: enable SEPARATE_CODE_AND_RODATA build flag

This patch enables the SEPARATE_CODE_AND_RODATA build flag for all
Tegra platforms, to allow setting proper MMU attributes for the RO
data and the code.

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 92024e9..3617396 100644
--- a/plat/nvidia/tegra/common/tegra_common.mk
+++ b/plat/nvidia/tegra/common/tegra_common.mk
@@ -36,6 +36,8 @@
 
 USE_COHERENT_MEM	:=	0
 
+SEPARATE_CODE_AND_RODATA :=	1
+
 PLAT_INCLUDES		:=	-Iplat/nvidia/tegra/include/drivers \
 				-Iplat/nvidia/tegra/include \
 				-Iplat/nvidia/tegra/include/${TARGET_SOC}