[VOL-4290] Voltha go library updates for gRPC migration

Change-Id: I1aa2774beb6b7ed7419bc45aeb53fcae8a8ecda0
diff --git a/pkg/events/eventif/events_proxy_if.go b/pkg/events/eventif/events_proxy_if.go
index 35f821f..e4ebc36 100644
--- a/pkg/events/eventif/events_proxy_if.go
+++ b/pkg/events/eventif/events_proxy_if.go
@@ -18,7 +18,8 @@
 
 import (
 	"context"
-	"github.com/opencord/voltha-protos/v4/go/voltha"
+
+	"github.com/opencord/voltha-protos/v5/go/voltha"
 )
 
 // EventProxy interface for eventproxy
@@ -31,6 +32,8 @@
 		subCategory *EventSubCategory, raisedTs int64) error
 	EnableLivenessChannel(ctx context.Context, enable bool) chan bool
 	SendLiveness(ctx context.Context) error
+	Start() error
+	Stop()
 }
 
 const (