Tegra: retrieve power domain tree from the platforms

The platform code generates the power domain tree. The handler to
retrieve the tree should also reside in the platform code.

This patch moves the plat_get_power_domain_tree_desc() to the
individual platforms.

Change-Id: Iaafc83ed381d83129501111ef655e3c58a8a553f
Signed-off-by: Anthony Zhou <anzhou@nvidia.com>
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 15dbd16..d6513eb 100644
--- a/plat/nvidia/tegra/soc/t186/plat_setup.c
+++ b/plat/nvidia/tegra/soc/t186/plat_setup.c
@@ -54,6 +54,14 @@
 	PLATFORM_MAX_CPUS_PER_CLUSTER
 };
 
+/*******************************************************************************
+ * This function returns the Tegra default topology tree information.
+ ******************************************************************************/
+const unsigned char *plat_get_power_domain_tree_desc(void)
+{
+	return tegra_power_domain_tree_desc;
+}
+
 /*
  * Table of regions to map using the MMU.
  */