VOL-4341 Add PPTP POTS UNI into the uni port list when ONU have a PPTP POTS UNI.

Change-Id: I5cb02d0582f1120ef6e6e4021000c48afc2df036
diff --git a/internal/pkg/onuadaptercore/mib_sync.go b/internal/pkg/onuadaptercore/mib_sync.go
index 567a3f4..3716352 100644
--- a/internal/pkg/onuadaptercore/mib_sync.go
+++ b/internal/pkg/onuadaptercore/mib_sync.go
@@ -52,6 +52,7 @@
 	me.CircuitPackClassID,                             // 6
 	me.SoftwareImageClassID,                           // 7
 	me.PhysicalPathTerminationPointEthernetUniClassID, // 11
+	me.PhysicalPathTerminationPointPotsUniClassID,     // 53
 	me.OltGClassID,                                    // 131
 	me.OnuPowerSheddingClassID,                        // 133
 	me.IpHostConfigDataClassID,                        // 134