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

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

Import HighPoint DC Series Data Center HBA (DC7280 and R750) driver.
This driver works for FreeBSD/i386 and FreeBSD/amd64 platforms.

Many thanks to HighPoint for providing this driver.

MFC after: 1 day

- Don't include date and time the driver is built, this is useful for
generating binary diffs.
- Constify a few strings used in the driver.
- Style changes to make the driver compile with default clang settings.

Approved by: HighPoint Technologies
MFC after: 3 days

When building with clang, disable -Wformat-security for
sys/dev/hpt27xx/osm_bsd.c, since it gets the following warnings:

sys/dev/hpt27xx/osm_bsd.c:1180:25: error: format string is not a string literal (potentially insecure) [-Werror,-Wformat-security]
S_IRUSR | S_IWUSR, driver_name);
^~~~~~~~~~~
@/dev/hpt27xx/hpt27xx_config.h:46:21: note: expanded from:
#define driver_name hpt27xx_driver_name
^~~~~~~~~~~~~~~~~~~

Since 'hpt27xx_driver_name' is a constant string symbol (coming from the
proprietary hpt27xx_lib.o file), there is no security problem.

Because this driver is provided by the vendor, and applying changes
requires re-certification and other bureaucratic exercises, just disable
the warning for now.

MFC after: 1 week

Import the first release of HighPoint RocketRAID 27xx SAS 6Gb/s HBA card
driver. This driver works for FreeBSD/i386 and FreeBSD/amd64 platforms.

Many thanks to HighPoint for providing this driver.

MFC after: 2 weeks