zynqmp: pm: Minor corrections for MISRA compliance

Various changes to comply with MISRA static analysis rules

Signed-off-by: Jolly Shah <jollys@xilinx.com>
diff --git a/plat/xilinx/zynqmp/pm_service/pm_api_sys.h b/plat/xilinx/zynqmp/pm_service/pm_api_sys.h
index a5e741d..c6de560 100644
--- a/plat/xilinx/zynqmp/pm_service/pm_api_sys.h
+++ b/plat/xilinx/zynqmp/pm_service/pm_api_sys.h
@@ -111,9 +111,9 @@
 enum pm_ret_status pm_pinctrl_request(unsigned int pin);
 enum pm_ret_status pm_pinctrl_release(unsigned int pin);
 enum pm_ret_status pm_pinctrl_get_function(unsigned int pin,
-					   unsigned int *value);
+					   enum pm_node_id *nid);
 enum pm_ret_status pm_pinctrl_set_function(unsigned int pin,
-					   unsigned int value);
+					   enum pm_node_id nid);
 enum pm_ret_status pm_pinctrl_get_config(unsigned int pin,
 					 unsigned int param,
 					 unsigned int *value);