Using Openolt-adapter:2.4.14 and rw-core:2.4.5 in VOLTHA-2.4

Change-Id: If9717a35d2387a3ab71809f745946c5141314c11
diff --git a/voltha/Chart.yaml b/voltha/Chart.yaml
index 73438e2..2bda7e6 100644
--- a/voltha/Chart.yaml
+++ b/voltha/Chart.yaml
@@ -14,7 +14,7 @@
 ---
 apiVersion: "v1"
 name: "voltha"
-version: "2.5.6"
+version: "2.5.7"
 description: "A Helm chart for Voltha based on K8S resources in Voltha project"
 keywords:
   - "onf"