[VOL-4900] openonuAdapterGo: Suppress OMCI timeout device event if OLT is not available

Change-Id: I05959e169abd7b022b8627a96a8ee509b9fdd5a8
diff --git a/internal/pkg/common/interfaces.go b/internal/pkg/common/interfaces.go
index 3268564..728d10e 100755
--- a/internal/pkg/common/interfaces.go
+++ b/internal/pkg/common/interfaces.go
@@ -88,6 +88,7 @@
 
 	SetReadyForOmciConfig(bool)
 	IsReadyForOmciConfig() bool
+	IsOltAvailable() bool
 
 	StorePersistentData(context.Context) error
 	StorePersUniFlowConfig(context.Context, uint8, *[]UniVlanFlowParams, bool) error