MFC r252867:

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.

(This changeset have not included changes found in 249468 and 246713)

(cherry picked from commit bbe575d85898a4942c9aeee7a8e18b6549702a4a)
(cherry picked from commit a40e3d1cdf4e05f9c6bba40be8fb995b84894486)