zynqmp: pm: Implement PM_INIT_FINALIZE PM API call

The PM_INIT_FINALIZE PM API is required to inform the PFW that APU is
done with requesting nodes and that not-requested nodes can be powered
down. If PM is not enabled, this call will never be made and PFW will
never power down any of the nodes which APU can use.

Signed-off-by: Filip Drazic <filip.drazic@aggios.com>
diff --git a/plat/xilinx/zynqmp/pm_service/pm_api_sys.h b/plat/xilinx/zynqmp/pm_service/pm_api_sys.h
index bdb0eac..135bcc8 100644
--- a/plat/xilinx/zynqmp/pm_service/pm_api_sys.h
+++ b/plat/xilinx/zynqmp/pm_service/pm_api_sys.h
@@ -76,6 +76,7 @@
 /* Miscellaneous API functions */
 enum pm_ret_status pm_get_api_version(unsigned int *version);
 enum pm_ret_status pm_set_configuration(unsigned int phys_addr);
+enum pm_ret_status pm_init_finalize(void);
 enum pm_ret_status pm_get_node_status(enum pm_node_id node,
 				      uint32_t *ret_buff);
 enum pm_ret_status pm_register_notifier(enum pm_node_id nid,