xilinx: versal: Add set wakeup source API

Implement set wakeup source API to pass SMC
call for set wakeup source to PLM (Platform Loader
and Manager).

Signed-off-by: Tejas Patel <tejas.patel@xilinx.com>
Signed-off-by: Jolly Shah <jolly.shah@xilinx.com>
Change-Id: I654ce07235c0fc7dfcb81bf98820153255f61537
diff --git a/plat/xilinx/versal/pm_service/pm_defs.h b/plat/xilinx/versal/pm_service/pm_defs.h
index bd74304..7d69699 100644
--- a/plat/xilinx/versal/pm_service/pm_defs.h
+++ b/plat/xilinx/versal/pm_service/pm_defs.h
@@ -30,6 +30,7 @@
 #define PM_FORCE_POWERDOWN		8U
 #define PM_ABORT_SUSPEND		9U
 #define PM_REQ_WAKEUP			10U
+#define PM_SET_WAKEUP_SOURCE		11U
 #define PM_SYSTEM_SHUTDOWN		12U
 #define PM_REQUEST_DEVICE		13U
 #define PM_RELEASE_DEVICE		14U