boardctl: added pm_checkstate() function to BOARDIOC_PM_CONTROL

boards/boardctl.c

@@ -262,6 +262,10 @@ static inline int boardctl_pmctrl(FAR struct boardioc_pm_ctrl_s *ctrl)
         ret = pm_changestate(ctrl->domain, ctrl->state);
         break;
 
+      case BOARDIOC_PM_CHECKSTATE:
+        ctrl->state = pm_checkstate(ctrl->domain);
+        break;
+
       default:
         ret = -EINVAL;
     }

include/sys/boardctl.h

@@ -226,7 +226,8 @@ enum boardioc_action_e
   BOARDIOC_PM_RELAX,
   BOARDIOC_PM_STAYCOUNT,
   BOARDIOC_PM_QUERYSTATE,
-  BOARDIOC_PM_CHANGESTATE
+  BOARDIOC_PM_CHANGESTATE,
+  BOARDIOC_PM_CHECKSTATE
 };
 
 struct boardioc_pm_ctrl_s