common: loop device work on zoned file systems

common: loop device work on zoned file systems

Remove the call to _require_non_zoned_device from _require_loop because
there is nothing that prevents loop device to work on file systems on
zoned devices.  But loop devices are not supported directly on top of
zoned block devices, so add a _require_non_zoned_device to generic/563
to not run that test on zoned block devices.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Zorro Lang <zlang@redhat.com>