fix in voltha-atests pipeline

Change-Id: Ie767ab0bba52ce10e6d0029e0d069b8cefb924f4
diff --git a/jjb/voltha-atest-provisioning.yaml b/jjb/voltha-atest-provisioning.yaml
index 30621dd..5bec5e0 100644
--- a/jjb/voltha-atest-provisioning.yaml
+++ b/jjb/voltha-atest-provisioning.yaml
@@ -61,6 +61,10 @@
             default: '$GERRIT_PATCHSET_NUMBER'
             description: 'PatchSet number in Gerrit'
 
+      - string:
+            name: adapter
+            default: ''
+            description: 'BLANK for ponsim'
       - bool:
          name: BuildVoltha
          default: true