Add privilegtes to #openstack-freezer

In order to modify channel topic, an access to the channel is needed.

Change-Id: Ib4fc0fd020b1ef30fa35870870b775c41263eb62
Signed-off-by: Dmitriy Rabotyagov <dmitriy.rabotyagov@cleura.com>

accessbot/channels.yaml

@@ -180,6 +180,8 @@ channels:
   - name: openstack-fenix
   - name: openstack-foxnut
   - name: openstack-freezer
+    ops:
+      - noonedeadpunk
   - name: openstack-functions
   - name: openstack-gate
   - name: openstack-gbp