Simplify block integrity registration

[Mike Snitzer]

On Thu, Aug 20 2015 at  4:41pm -0400,
Martin K. Petersen <martin.petersen at oracle.com> wrote:

> 
> Had a couple of requests this week so here is the latest version of the
> patch set that removes the dynamic integrity allocation to ease the
> registration headaches for nvme and nvdimm.
> 
> Mike, I'd appreciate if you could check the DM bits.

I'm just starting vacation until 8/26.  But I'll certainly review once I
get back.