Cleanup messed up actionstatus sorting. We used sort param but had

hardcoded sorting in the reposirory. I added also reportAt based
sorting.

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

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

@@ -20,7 +20,12 @@ public enum ActionStatusFields implements FieldNameProvider {
     /**
      * The id field.
      */
-    ID("id");
+    ID("id"),
+
+    /**
+     * The reportedAt field.
+     */
+    REPORTED_AT("createdAt");
 
     private final String fieldName;