[PATCH V3] nvme: enable ro namespace for ZNS without append

[Sagi Grimberg]

>> -	if (id->nsattr & NVME_NS_ATTR_RO)
>> +	if (id->nsattr & NVME_NS_ATTR_RO || test_bit(NVME_NS_FORCE_RO, &ns->flags))
>>   		set_disk_ro(disk, true);
> 
> If the FORCE_RO flag is set, the disk is set to read-only. If that flag
> is later cleared, nothing clears the disk's read-only setting.

Yea, that is true also for the non-force case, but before it broke
BLKROSET so I reverted that. We can use this FORCE_RO for BLKROSET as
well I think...