remove DataVolume feature gate
remove DataVolume feature gate

Signed-off-by: Ashley Schuett <5efdcf9ff345ae8b4054748d572450b8249dd91e@gmail.com>

davidvossel/kubevirt,davidvossel/kubevirt,kubevirt/kubevirt,stu-gott/kubevirt,davidvossel/kubevirt,kubevirt/kubevirt,stu-gott/kubevirt,davidvossel/kubevirt,kubevirt/kubevirt,stu-gott/kubevirt,stu-gott/kubevirt,kubevirt/kubevirt