MFC r351356:

Create a AHCI attachment for nvme.

MFC r351355:

Separate the pci attachment from the rest of nvme

Belatedly add opt_nvme.h to fix building nvme.ko outside of a kernel
build.

Sponsored by: Netflix

Add nvme_sim.c since that's not runtime switchable.

Sponsored by: Netflix

sys/modules: normalize .CURDIR-relative paths to SRCTOP

This simplifies make output/logic

Tested with: `cd sys/modules; make ALL_MODULES=` on amd64
MFC after: 1 month
Sponsored by: Dell EMC Isilon

Fix "make depend" with nvme.ko: add opt_cam.h to SRCS

MFC after: 1 week
X-MFC with: r301778
Sponsored by: Dell EMC Isilon

Add message when nvd disks are attached and detached.

As part of this commit, add an nvme_strvis() function which borrows
heavily from cam_strvis(). This will allow stripping of
leading/trailing wh

Add message when nvd disks are attached and detached.

As part of this commit, add an nvme_strvis() function which borrows
heavily from cam_strvis(). This will allow stripping of
leading/trailing whitespace and also handle unprintable characters
in model/serial numbers. This function goes into a new nvme_util.c
file which is used by both the driver and nvmecontrol.

Sponsored by: Intel
Reviewed by: carl
MFC after: 3 days

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Move the busdma mapping functions to nvme_qpair.c.

This removes nvme_uio.c completely.

Sponsored by: Intel

Add nvme(4) and nvd(4) Makefiles to the tree.

Noticed by: pluknet
Pointy-hat to: jimharris