VOL-3074: Create node affinity for openolt adapter image

Change-Id: I168ac28aacebb02cc0b4a8e95e78cbc29a13422b
diff --git a/voltha-adapter-openolt/values.yaml b/voltha-adapter-openolt/values.yaml
index 7719a0c..1d027d7 100644
--- a/voltha-adapter-openolt/values.yaml
+++ b/voltha-adapter-openolt/values.yaml
@@ -38,6 +38,12 @@
   runAsUser: 1001
   runAsGroup: 1001
 
+# Node Affinity Configuration
+nodeAffinityConfig:
+  enabled: false
+  node_label_key: "in-band"
+  node_label_value: "yes"
+
 # Define connectivity to required services
 services:
   kafka: