fix(plat/xilinx/versal): use sync method for blocking calls

All API calls except non-blocking should wait for
IPI response and read buffer to check return status
from firmware. Some of API calls are not reading
status from IPI payload data. Use sync method which
reads actual return status from IPI payload.

Signed-off-by: Abhyuday Godhasara <abhyuday.godhasara@xilinx.com>
Change-Id: I6f568b85d0da639c264f507122e3015807d8423d
diff --git a/plat/xilinx/versal/pm_service/pm_api_sys.c b/plat/xilinx/versal/pm_service/pm_api_sys.c
index 15fe187..912835a 100644
--- a/plat/xilinx/versal/pm_service/pm_api_sys.c
+++ b/plat/xilinx/versal/pm_service/pm_api_sys.c
@@ -173,7 +173,7 @@
 	/* Send request to the PLM */
 	PM_PACK_PAYLOAD3(payload, LIBPM_MODULE_ID, flag, PM_ABORT_SUSPEND,
 			 reason, primary_proc->node_id);
-	return pm_ipi_send(primary_proc, payload);
+	return pm_ipi_send_sync(primary_proc, payload, NULL, 0);
 }
 
 /**
@@ -909,7 +909,7 @@
 
 	PM_PACK_PAYLOAD4(payload, LIBPM_MODULE_ID, flag, PM_SET_WAKEUP_SOURCE,
 			 target, wkup_device, enable);
-	return pm_ipi_send(primary_proc, payload);
+	return pm_ipi_send_sync(primary_proc, payload, NULL, 0);
 }
 
 /**