VOL-3589 Update voltha go to support new version v4 of voltha protos

Change-Id: I32074b5c05b08f8ebd2205f8dc2af225bff465cc
diff --git a/rw_core/core/device/logical_port/common.go b/rw_core/core/device/logical_port/common.go
index 7edc663..4365d6d 100644
--- a/rw_core/core/device/logical_port/common.go
+++ b/rw_core/core/device/logical_port/common.go
@@ -18,7 +18,7 @@
 package port
 
 import (
-	"github.com/opencord/voltha-lib-go/v3/pkg/log"
+	"github.com/opencord/voltha-lib-go/v4/pkg/log"
 )
 
 var logger log.CLogger
diff --git a/rw_core/core/device/logical_port/loader.go b/rw_core/core/device/logical_port/loader.go
index aae4dbe..c81857f 100644
--- a/rw_core/core/device/logical_port/loader.go
+++ b/rw_core/core/device/logical_port/loader.go
@@ -22,8 +22,8 @@
 	"sync"
 
 	"github.com/opencord/voltha-go/db/model"
-	"github.com/opencord/voltha-lib-go/v3/pkg/log"
-	"github.com/opencord/voltha-protos/v3/go/voltha"
+	"github.com/opencord/voltha-lib-go/v4/pkg/log"
+	"github.com/opencord/voltha-protos/v4/go/voltha"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
 )