metadata v0.90 is deprecated thing and unsupported to create by some new
mdadm versions. It's possible to assemble this array (with
default_layout=1 on modprobe raid0), but impossible to create a new
one.
References: 4ae96cf77b
Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=1826251
Signed-off-by: Karel Zak <kzak@redhat.com>