MFC r254906 -- add SYSPD (real jbod) support to mfiutil

MFC r254906 -- add SYSPD (real jbod) support to mfiutil

Add support to reconfigure a drive as SYSPD (real JBOD in LSI
terminology).

Adds command "mfiutil syspd <drive#>" to change a drive to SYSPD.  Drive
will then be scanned/reported immediately as /dev/mfisyspdX by the host.

"mfiutil good <drive#>" clears SYSPD mode, remove /dev/mfisyspdX and
sets disk into UNCONFIGURED mode.

Tested on Dell H310 SAS/SATA RAID controller.

git-svn-id: svn://svn.freebsd.org/base/stable/8@255430 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f