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

Change-Id: I2916b83e859977ee57282c8a4fffad7926ce9861
diff --git a/vendor/modules.txt b/vendor/modules.txt
index cf7418e..6ef7e92 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -77,7 +77,7 @@
 github.com/opencord/voltha-lib-go/v4/pkg/db
 github.com/opencord/voltha-lib-go/v4/pkg/db/kvstore
 github.com/opencord/voltha-lib-go/v4/pkg/log
-# 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