MFC r288374:

MFC r288374:
  In addition to the ubldr file, also copy ubldr.bin to the
  MS-DOS partition.  This will help with transitioning to
  a single arm/armv6 userland build which could be used for
  all FreeBSD/armv6 images without UBLDR_LOADADDR being set
  for each board (ultimately requiring a separate buildworld
  for each currently).

Sponsored by:	The FreeBSD Foundation

git-svn-id: svn://svn.freebsd.org/base/stable/10@288469 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f