MFC r299319

MFC r299319

sfxge(4): add TLV item manipulation functions to common code

Add creation, deletion and checksumming operations to the private copy of
TLV functions in the common code.  Functions added in preparation for V3
licensing support, as licensing keys are stored in the TLV format.  Missing
support for multiple segment partitions added. Annotations for Windows code
analysis also updated.

Submitted by:   Richard Houldsworth <rhouldsworth at solarflare.com>
Sponsored by:   Solarflare Communications, Inc.

git-svn-id: svn://svn.freebsd.org/base/stable/10@301322 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f