Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Re-do r255853. Along with adding back the API/ABI changes from the
original, this hides the contents of cam_compat.h from ktrace/kdump/truss,
avoiding problems there. There are no user-servicable parts in there, so
no need for those tools to be groping around in there.

Approved by: re

Revert r255853 pending fixes to build errors in usr.bin/kdump

Approved by: re (implicit)

Update the CAM API for FreeBSD 10:

- Remove the timeout_ch field. It's been deprecated since FreeBSD 7.0;
MPSAFE drivers should be managing their own timeout storage. The
remaining non-MPSAFE drivers have been modified to also manage their own
storage, and should be considered for updating to MPSAFE (or removal)
during the FreeBSD 10.x lifecycle.

- Add fields related to soft timeouts and quality of service, to be used
in upcoming work.

- Add room for more flags in the CCB header and path_inq structures.

- Begin support for extended 64-bit LUNs.

- Bump the CAM version number to 0x18, but add compat shims. Tested with
camcontrol and smartctl.

Reviewed by: nathanw, ken, kib
Approved by: re
Obtained from: Netflix

Remove ancient compatibility cruft.

Reviewed by: delphij

Update hptiop(4) to version 1.8, which added support for HighPoint
RocketRAID 4500 series.

Many thanks to HighPoint Technologies for their continued support
of FreeBSD!

Submitted by: HighPoint Technologies
MFC after: 3 days

Use __packed from cdefs.h

Submitted by: pyunyh
Reviewed by: Shaowei WANG <wsw1wsw2 gmail com>
MFC after: 2 weeks

Use __attribute__((packed)) for the structure so that hptiop management
utility would work.

Submitted by: Shaowei WANG <wsw1wsw2 gmail com>
MFC after: 2 weeks

- Spell cam correctly (scbus), this makes it possible to compile hptiop
in GENERIC and LINT. [1]
- Rename hpt_dbg_level to hpt_iop_dbg_level to avoid multiple definition
of hpt_dbg_level (hptmv also has hpt_dbg_level).

PR: 127551 [1]
Reviewed by: scottl@
MFC after: 1 month

Update the hptiop driver to version 1.3. This adds support for the 4xxx
series of adapters. Thanks again to Highpoint for their continued support
of FreeBSD.

Submitted by: Highpoint Technologies

Introduce a driver for the Highpoint RocketRAID 3xxx series of controllers.
The driver relies on CAM.

Many thanks to Highpoint for providing this driver.