nvme: enable char device per namespace

[Javier González]

On 17.12.2020 02:53, Keith Busch wrote:
>On Wed, Dec 16, 2020 at 06:43:22PM +0100, Javier González wrote:
>> Thanks Keith. I will send a new version today.
>>
>> Regarding nvme-cli: what are your thoughts?
>
>I was thinking we could add a column for these with the '--verbose'
>option in the namespace section.

Makes sense. I will look into it - probably on the other side of
Christmas. Should give plenty of time since this till not be merged
until 5.12.

Should give me time to add multipath in a follow-up patch then.