lvm: avoid the use of IO uring

lvm: avoid the use of IO uring

there may be a kernel issue or a bug in how QEMU uses io_uring, but
we have users that report crashes which f.ebner could see on some
workloads, not really deterministic though and it seems that in newer
kernel versions (5.12+) the crash becomes a hang

While we're closing in on the actual issue here (which could be the
same as for RBD) let's disable io_uring for LVM.

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>