[VOL-4080] Extend GetExtValue api to read transceiver rx-power on demand.

Change-Id: I3b9728f9eeb9c5b17df41774d21bd16ddc7b69c0
diff --git a/go.sum b/go.sum
index a3a2ff8..58ce87a 100644
--- a/go.sum
+++ b/go.sum
@@ -144,8 +144,8 @@
 github.com/opencord/voltha-lib-go/v4 v4.3.1 h1:z2CgB3un53IgbYTsz+pdRtmQ3E6e6+PieGQDyHaQN1A=
 github.com/opencord/voltha-lib-go/v4 v4.3.1/go.mod h1:65GN71j4os0ApBRR+xbJ93iAMJMKIwVi/npG/hbPt8w=
 github.com/opencord/voltha-protos/v4 v4.1.1/go.mod h1:W/OIFIyvFh/C0vchRUuarIsMylEhzCRM9pNxLvkPtKc=
-github.com/opencord/voltha-protos/v4 v4.1.7 h1:0YSof3tfWWJgRoR3TtD+aTmUHNE/EjFdTsfU1xJnaZA=
-github.com/opencord/voltha-protos/v4 v4.1.7/go.mod h1:W/OIFIyvFh/C0vchRUuarIsMylEhzCRM9pNxLvkPtKc=
+github.com/opencord/voltha-protos/v4 v4.1.8 h1:TeK0RlhKxGfrdIpcngJmbD7ttT5x9+Fyjn1haS/jh4s=
+github.com/opencord/voltha-protos/v4 v4.1.8/go.mod h1:W/OIFIyvFh/C0vchRUuarIsMylEhzCRM9pNxLvkPtKc=
 github.com/opentracing/opentracing-go v1.1.0 h1:pWlfV3Bxv7k65HYwkikxat0+s3pV4bsqf19k25Ur8rU=
 github.com/opentracing/opentracing-go v1.1.0/go.mod h1:UkNAQd3GIcIGf0SeVgPpRdFStlNbqXla1AfSYxPUl2o=
 github.com/phayes/freeport v0.0.0-20180830031419-95f893ade6f2 h1:JhzVVoYvbOACxoUmOs6V/G4D5nPVUW73rKvXxP4XUJc=