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_api_sys.h b/plat/xilinx/versal/pm_service/pm_api_sys.h
index 025255b..3751995 100644
--- a/plat/xilinx/versal/pm_service/pm_api_sys.h
+++ b/plat/xilinx/versal/pm_service/pm_api_sys.h
@@ -53,5 +53,7 @@
 				    uint32_t *value);
 enum pm_ret_status pm_pll_set_mode(uint32_t clk_id, uint32_t mode);
 enum pm_ret_status pm_pll_get_mode(uint32_t clk_id, uint32_t *mode);
+enum pm_ret_status pm_force_powerdown(uint32_t target, uint8_t ack);
+enum pm_ret_status pm_system_shutdown(uint32_t type, uint32_t subtype);
 
 #endif /* PM_API_SYS_H */