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

Change-Id: I3b9728f9eeb9c5b17df41774d21bd16ddc7b69c0
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 0a026a0..7b9715b 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -75,7 +75,7 @@
 github.com/opencord/voltha-lib-go/v4/pkg/probe
 github.com/opencord/voltha-lib-go/v4/pkg/techprofile
 github.com/opencord/voltha-lib-go/v4/pkg/version
-# github.com/opencord/voltha-protos/v4 v4.1.7
+# github.com/opencord/voltha-protos/v4 v4.1.8
 ## explicit
 github.com/opencord/voltha-protos/v4/go/common
 github.com/opencord/voltha-protos/v4/go/ext/config