Tegra: memctrl_v2: config to enable SMMU device

This patch adds a config to the memory controller driver to enable SMMU
device init during boot. Tegra186 platforms keeps it enabled by default,
but future platforms might not support it.

Change-Id: Iebe1c60a25fc1cfb4c97a507e121d6685a49cb83
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
diff --git a/plat/nvidia/tegra/soc/t186/plat_setup.c b/plat/nvidia/tegra/soc/t186/plat_setup.c
index c401b85..7108723 100644
--- a/plat/nvidia/tegra/soc/t186/plat_setup.c
+++ b/plat/nvidia/tegra/soc/t186/plat_setup.c
@@ -104,8 +104,10 @@
 			MT_DEVICE | MT_RW | MT_SECURE),
 	MAP_REGION_FLAT(TEGRA_ARM_ACTMON_CTR_BASE, 0x20000, /* 128KB - ARM/Denver */
 			MT_DEVICE | MT_RW | MT_SECURE),
+#if ENABLE_SMMU_DEVICE
 	MAP_REGION_FLAT(TEGRA_SMMU_BASE, 0x1000000, /* 64KB */
 			MT_DEVICE | MT_RW | MT_SECURE),
+#endif
 	{0}
 };