hw/block/nvme: Add injection of Offline/Read-Only zones

hw/block/nvme: Add injection of Offline/Read-Only zones

ZNS specification defines two zone conditions for the zones that no
longer can function properly, possibly because of flash wear or other
internal fault. It is useful to be able to "inject" a small number of
such zones for testing purposes.

This commit defines two optional device properties, "offline_zones"
and "rdonly_zones". Users can assign non-zero values to these variables
to specify the number of zones to be initialized as Offline or
Read-Only. The actual number of injected zones may be smaller than the
requested amount - Read-Only and Offline counts are expected to be much
smaller than the total number of zones on a drive.

Signed-off-by: Dmitry Fomichev <dmitry.fomichev@wdc.com>