vim: fix up for /bin/vi

* it was changed in:
  Commit: 95dc2ddc
  URL:    http://git.openembedded.org/?p=meta-openembedded.git&a=commit;h=95dc2ddce7a0ee4d16d6c69fd123e4e6921bdf2e


  Author: Jackie Huang <jackie.huang@windriver.com>
  Date:   Thu Nov  6 03:22:27 2014 -0500
  Subject: vim: add recipe for vim-tiny

  but busybox still registers /bin/vi, so u-a was broken
  update-alternatives: Error: cannot register alternative vi to
  /usr/bin/vi since it is already registered to /bin/vi

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>