hardware: invoke alarm when sensor goes nonoperational

Change-Id: I88266d453bbade1cb8d703d4f7f0b87cd7e454d7
diff --git a/yang/velia-alarms@2022-07-12.yang b/yang/velia-alarms@2022-07-12.yang
index f4d30c7..5756c0c 100644
--- a/yang/velia-alarms@2022-07-12.yang
+++ b/yang/velia-alarms@2022-07-12.yang
@@ -30,6 +30,11 @@
         description "Alarm to model that sensor is missing.";
     }
 
+    identity sensor-nonoperational {
+        base sensor-alarm;
+        description "Sensor is set as nonoperational.";
+    }
+
     identity sensor-threshold-crossing-alarm {
         base sensor-alarm;
         description "Abstract base for sensor threshold crossing.";