Switched to REPORTEDAT to be more consitend with other fields.

Signed-off-by: Kai Zimmermann <kai.zimmermann@bosch-si.com>

hawkbit-core/src/main/java/org/eclipse/hawkbit/repository/ActionStatusFields.java

@@ -25,7 +25,7 @@ public enum ActionStatusFields implements FieldNameProvider {
     /**
      * The reportedAt field.
      */
-    REPORTED_AT("createdAt");
+    REPORTEDAT("createdAt");
 
     private final String fieldName;