Update to omci-lib-go version 1.15.2

Change-Id: I383f643458f7edac5174408b5b3083afa6c584f6
diff --git a/vendor/github.com/opencord/omci-lib-go/layers.go b/vendor/github.com/opencord/omci-lib-go/layers.go
index f05c34b..6eb09a9 100644
--- a/vendor/github.com/opencord/omci-lib-go/layers.go
+++ b/vendor/github.com/opencord/omci-lib-go/layers.go
@@ -154,6 +154,7 @@
 	nextLayerMapping[TestRequestType] = LayerTypeTestRequest
 	nextLayerMapping[StartSoftwareDownloadRequestType] = LayerTypeStartSoftwareDownloadRequest
 	nextLayerMapping[DownloadSectionRequestType] = LayerTypeDownloadSectionRequest
+	nextLayerMapping[DownloadSectionRequestWithResponseType] = LayerTypeDownloadSectionRequest
 	nextLayerMapping[EndSoftwareDownloadRequestType] = LayerTypeEndSoftwareDownloadRequest
 	nextLayerMapping[ActivateSoftwareRequestType] = LayerTypeActivateSoftwareRequest
 	nextLayerMapping[CommitSoftwareRequestType] = LayerTypeCommitSoftwareRequest