VOL-936 Update protos to latest and mark GetExtValue as NotImplemented

Change-Id: Ic80e8f3cbffa022d0abfe3a0845ebe6b3adfa83f
diff --git a/go.sum b/go.sum
index 791713f..a86240b 100644
--- a/go.sum
+++ b/go.sum
@@ -200,6 +200,8 @@
 github.com/opencord/voltha-lib-go/v3 v3.1.6/go.mod h1:s8rmoVjsI0qjOf7xJIh4VmUSxZLOn/XEiFAT3Amf3y4=
 github.com/opencord/voltha-protos/v3 v3.3.2 h1:a3PKf+jaiCD15iXpgL8dqW+WvfgiM0qv7mFA4nIJtH8=
 github.com/opencord/voltha-protos/v3 v3.3.2/go.mod h1:nl1ETp5Iw3avxOaKD8BJlYY5wYI4KeV95aT1pL63nto=
+github.com/opencord/voltha-protos/v3 v3.3.3 h1:OO0H+YMxjLFQifoYXwBp1JN5rpEVMQnhGGEdP6pLrY0=
+github.com/opencord/voltha-protos/v3 v3.3.3/go.mod h1:nl1ETp5Iw3avxOaKD8BJlYY5wYI4KeV95aT1pL63nto=
 github.com/pascaldekloe/goe v0.0.0-20180627143212-57f6aae5913c/go.mod h1:lzWF7FIEvWOWxwDKqyGYQf6ZUaNfKdP144TG7ZOy1lc=
 github.com/pascaldekloe/goe v0.1.0 h1:cBOtyMzM9HTpWjXfbbunk26uA6nG3a8n06Wieeh0MwY=
 github.com/pascaldekloe/goe v0.1.0/go.mod h1:lzWF7FIEvWOWxwDKqyGYQf6ZUaNfKdP144TG7ZOy1lc=