zynqmp: PM: Migrate to new shutdown interface

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
diff --git a/plat/xilinx/zynqmp/pm_service/pm_svc_main.c b/plat/xilinx/zynqmp/pm_service/pm_svc_main.c
index d635583..c062392 100644
--- a/plat/xilinx/zynqmp/pm_service/pm_svc_main.c
+++ b/plat/xilinx/zynqmp/pm_service/pm_svc_main.c
@@ -152,7 +152,7 @@
 		SMC_RET1(handle, (uint64_t)ret);
 
 	case PM_SYSTEM_SHUTDOWN:
-		ret = pm_system_shutdown(pm_arg[0]);
+		ret = pm_system_shutdown(pm_arg[0], pm_arg[1]);
 		SMC_RET1(handle, (uint64_t)ret);
 
 	case PM_REQ_NODE: