VOL-3835: Add support for reporting L2 PM counters

Change-Id: Ibe64b94d442b7ce83965824beb18d0a281c64a6b
diff --git a/internal/bbsim/devices/onu.go b/internal/bbsim/devices/onu.go
index 86c70ba..465f2cd 100644
--- a/internal/bbsim/devices/onu.go
+++ b/internal/bbsim/devices/onu.go
@@ -728,6 +728,9 @@
 				}).Error("send-TestResult-indication-failed")
 			}
 		}
+	case omci.SynchronizeTimeRequestType:
+		// MDS counter increment is not required for this message type
+		responsePkt, _ = omcilib.CreateSyncTimeResponse(omciPkt, omciMsg)
 	default:
 		log.WithFields(log.Fields{
 			"omciMsgType":  omciMsg.MessageType,