In the cinder Helm-chart the secret-ingress-tls template was
pointing to a backendServiceType that no longer existed.
A recent review [1] changed the key in secrets.tls from "volume"
to "volumev3". This review changes the value of backendServiceType
to match the same change mentioned above.
[1] - https://review.opendev.org/c/openstack/openstack-helm/+/935896
Change-Id: I76a616214db13f7611eac609d1a7b4f8ac258181
Signed-off-by: Daniel Caires <DanielMarques.Caires@windriver.com>