Enable DHCP trap-on-nni flow for TT workflow

Change-Id: I4c51e2ee35c1041b154f7d8cdae32c17cd6fba74
diff --git a/Jenkinsfile-voltha-build b/Jenkinsfile-voltha-build
index e57521c..65b1b19 100644
--- a/Jenkinsfile-voltha-build
+++ b/Jenkinsfile-voltha-build
@@ -146,7 +146,7 @@
                     if [[ "${workFlow}" == "DT" ]]; then
                        WITH_EAPOL=no WITH_DHCP=no WITH_IGMP=no WITH_RADIUS=no ./voltha up
                     elif [[  "${workFlow}" == "TT" ]]; then
-                       WITH_EAPOL=no WITH_DHCP=no WITH_INCREMENTAL_EVTO_UPDATE=yes WITH_IGMP=yes WITH_RADIUS=no ./voltha up
+                       WITH_EAPOL=no WITH_DHCP=yes WITH_INCREMENTAL_EVTO_UPDATE=yes WITH_IGMP=yes WITH_RADIUS=no ./voltha up
                     else
                        ./voltha up
                     fi