xilinx: versal: Implement power down/restart related EEMI API

Add power down/restart related below API
 - Force power down
 - System shutdown

Signed-off-by: Tejas Patel <tejas.patel@xilinx.com>
Signed-off-by: Jolly Shah <jolly.shah@xilinx.com>
Change-Id: Icd4a922923b1fd50eca1f5361f1e604aedcdb529
diff --git a/plat/xilinx/versal/pm_service/pm_defs.h b/plat/xilinx/versal/pm_service/pm_defs.h
index ce2605a..248c715 100644
--- a/plat/xilinx/versal/pm_service/pm_defs.h
+++ b/plat/xilinx/versal/pm_service/pm_defs.h
@@ -27,7 +27,9 @@
 #define PM_GET_DEVICE_STATUS		3U
 #define PM_REQ_SUSPEND			6U
 #define PM_SELF_SUSPEND			7U
+#define PM_FORCE_POWERDOWN		8U
 #define PM_ABORT_SUSPEND		9U
+#define PM_SYSTEM_SHUTDOWN		12U
 #define PM_REQUEST_DEVICE		13U
 #define PM_RELEASE_DEVICE		14U
 #define PM_SET_REQUIREMENT		15U