MFC r276539: Update ELF headers to include additional defines

MFC r276539: Update ELF headers to include additional defines

The elftoolchain project includes these additional defines for various
userland programs. Given that arch-specific defines are still interesting
in the context of userland programs reading or writing ELF metadata, they
should be included in top-level ELF headers.

Remove duplicate defines from ARM and MIPS elf headers.

Submitted by:	will (initial version)
Sponsored by:	The FreeBSD Foundation

git-svn-id: svn://svn.freebsd.org/base/stable/10@294459 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f