sysutils/vzvol: Fix wrong dependency (from virtualbox-ose port) to fix the build

PR: 225043
Submitted by: Philip Jocks <freebsdbugs@filis.org>
Reported by: Philip Jocks <freebsdbugs@filis.org>
Approved by: Rainbow <rainbow@purlinux.org> (maintainer)
Sponsored by: Netzkommune GmbH