[VOL-1385] : Changes to support ONU delete
 Tested with,
1. ONU disable->delete
2. ONU delete
3. OLT delete

Change-Id: I8e6ff41a7ea8e94014700f274cb24fea73ac41f4
diff --git a/rw_core/core/device_state_transitions.go b/rw_core/core/device_state_transitions.go
index 7756bf4..0a6264b 100644
--- a/rw_core/core/device_state_transitions.go
+++ b/rw_core/core/device_state_transitions.go
@@ -96,7 +96,13 @@
 			deviceType:    child,
 			previousState: DeviceState{Admin: voltha.AdminState_DISABLED, Connection: voltha.ConnectStatus_UNKNOWN, Operational: voltha.OperStatus_UNKNOWN},
 			currentState:  DeviceState{Admin: voltha.AdminState_DELETED, Connection: voltha.ConnectStatus_UNKNOWN, Operational: voltha.OperStatus_UNKNOWN},
-			handlers:      []TransitionHandler{dMgr.DeleteLogicalPorts, dMgr.RunPostDeviceDelete}})
+			handlers:      []TransitionHandler{dMgr.ChildDeviceLost, dMgr.DeleteLogicalPorts, dMgr.RunPostDeviceDelete}})
+	transitionMap.transitions = append(transitionMap.transitions,
+		Transition{
+			deviceType:    child,
+			previousState: DeviceState{Admin: voltha.AdminState_ENABLED, Connection: voltha.ConnectStatus_UNKNOWN, Operational: voltha.OperStatus_UNKNOWN},
+			currentState:  DeviceState{Admin: voltha.AdminState_DELETED, Connection: voltha.ConnectStatus_UNKNOWN, Operational: voltha.OperStatus_UNKNOWN},
+			handlers:      []TransitionHandler{dMgr.ChildDeviceLost, dMgr.DeleteLogicalPorts, dMgr.RunPostDeviceDelete}})
 	transitionMap.transitions = append(transitionMap.transitions,
 		Transition{
 			deviceType:    any,