As part of the move to helm v3, all the charts in the OSH repos
will no longer lint/build properly due to a lack of helm serve
in helm v3.
This change modifies the helm-toolkit repo location to the
osh-infra repo in order to account for the removal oh helm serve.
This work is part of the migration to helm v3 and will be utilized
in future changes.
Change-Id: I90d25943d69ad6c76455f7778a4894f00c525c46
c20c1e4400