ti: k3: common: Add root domain node to platform topology

Actions may need to be taken by the last core when all clusters
have been shutdown. Add a top level root domain node to coordinate
this between clusters.

Signed-off-by: Andrew F. Davis <afd@ti.com>
diff --git a/plat/ti/k3/include/platform_def.h b/plat/ti/k3/include/platform_def.h
index 8856af2..ebc9c47 100644
--- a/plat/ti/k3/include/platform_def.h
+++ b/plat/ti/k3/include/platform_def.h
@@ -62,9 +62,10 @@
 
 #define PLATFORM_CLUSTER_OFFSET		K3_CLUSTER0_MSMC_PORT
 
-#define PLAT_NUM_PWR_DOMAINS		(PLATFORM_CLUSTER_COUNT + \
+#define PLAT_NUM_PWR_DOMAINS		(PLATFORM_SYSTEM_COUNT + \
+					PLATFORM_CLUSTER_COUNT + \
 					PLATFORM_CORE_COUNT)
-#define PLAT_MAX_PWR_LVL		MPIDR_AFFLVL1
+#define PLAT_MAX_PWR_LVL		MPIDR_AFFLVL2
 
 /*******************************************************************************
  * Memory layout constants