bhyve NVMe 1.4 support

From: Chuck Tuffli <chuck_at_tuffli.net>
Date: Tue, 07 Dec 2021 15:58:02 UTC 
I've been working on a patch series to get bhyve's NVMe emulation
compliant with the v1.4 specification. The compliance tests now pass,
and I will work on getting the patches up for review "soon". In the
meantime, there is a copy of the full changes if anyone is interested
in testing on current or 13-stable.

https://people.freebsd.org/~chuck/nvme-1.4/pci_nvme.c

--chuck