Some less commonly used drivers were omitted when we switched
the allocator from a plain VIR_ALLOC to virDomainFSDefNew.

https://bugzilla.redhat.com/show_bug.cgi?id=1846450

Fixes: da665fbdSigned-off-by: NJán Tomko <jtomko@redhat.com>
Reviewed-by: NAndrea Bolognani <abologna@redhat.com>