Rename DT_FEATURE_1 to DT_FEATURE

This provides a minor cleanup in elfdump; there are otherwise no
consumers in the tree.  Old SUN documentation can be found for either
variant, but GNU binutils switched to DT_FEATURE around 2000.

Sponsored by:	The FreeBSD Foundation
elfdump: Remove extraneous _SUNW_ in reported DT_ names

Sponsored by:	The FreeBSD Foundation
Add the Samsung 843T as a 4k enabled drive

Submitted by:	Jason Wolfe <jason@llnw.com>
MFC after:	2 weeks
Sponsored by:	Limelight Networks