Add 120 build timeout to helm jobs

Helm jobs often terminate due to timeout.
Increasing from 90 to 120

Change-Id: I4c051e9aa5e2f802ce0a80091721cdb9677568e0
Issue-ID: CIMAN-33
Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>
diff --git a/jjb/global-templates-helm.yaml b/jjb/global-templates-helm.yaml
index 3d0f170..a147e1a 100644
--- a/jjb/global-templates-helm.yaml
+++ b/jjb/global-templates-helm.yaml
@@ -20,6 +20,7 @@
     submodule-disable: false
     submodule-recursive: true
     submodule-timeout: 10
+    build-timeout: 120
 
     #####################
     # Job Configuration #