xilinx: versal: Add PSCI APIs for suspend/resume

Add following APIs in plat_psci to support suspend resume:
- versal_pwr_domain_off
- versal_pwr_domain_suspend
- versal_pwr_domain_suspend_finish
- versal_validate_power_state
- versal_get_sys_suspend_power_state

Signed-off-by: Tejas Patel <tejas.patel@xilinx.com>
Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>
Signed-off-by: Jolly Shah <jolly.shah@xilinx.com>
Change-Id: Ife908a45f32e2037c9c19e13211a8e4b373b8342
diff --git a/plat/xilinx/versal/pm_service/pm_defs.h b/plat/xilinx/versal/pm_service/pm_defs.h
index 7d69699..f090db5 100644
--- a/plat/xilinx/versal/pm_service/pm_defs.h
+++ b/plat/xilinx/versal/pm_service/pm_defs.h
@@ -15,6 +15,13 @@
  * Macro definitions
  ********************************************************************/
 
+/* State arguments of the self suspend */
+#define PM_STATE_CPU_IDLE	0x0U
+#define PM_STATE_SUSPEND_TO_RAM	0xFU
+
+#define MAX_LATENCY		(~0U)
+#define MAX_QOS			100U
+
 /* Processor core device IDs */
 #define APU_DEVID(IDX)	NODEID(XPM_NODECLASS_DEVICE, XPM_NODESUBCL_DEV_CORE, \
 			       XPM_NODETYPE_DEV_CORE_APU, (IDX))