Make NVME shutdown two-pass - Version 4

[Keith Busch]

On Wed, Jan 03, 2024 at 01:04:00PM -0800, Jeremy Allison wrote:
> This is version 4 of a patchset originally written by
> Tanjore Suresh <tansuresh at google.com> to make shutdown
> of nvme devices two-pass.

I've tested the series on a few systems with a variety of nvme devices,
and this noticably improves shutdown time, and no problems observed. I
haven't looked at the new code details yet, but it works!