Fix update_pm_config rpc case letter

Change-Id: Ibc991ca239dfe8c30382900a50d148f719134813
diff --git a/rw_core/core/device/remote/adapter_proxy.go b/rw_core/core/device/remote/adapter_proxy.go
index 6bb318b..939f301 100755
--- a/rw_core/core/device/remote/adapter_proxy.go
+++ b/rw_core/core/device/remote/adapter_proxy.go
@@ -328,7 +328,7 @@
 	if err != nil {
 		return nil, err
 	}
-	rpc := "Update_pm_config"
+	rpc := "update_pm_config"
 	args := []*kafka.KVArg{
 		{Key: "device", Value: device},
 		{Key: "pm_configs", Value: pmConfigs},