This config item has not carried much meaning for a while now and is
almost always enabled by default. As agreed during the Linux kernel
summit, remove it.

CC: Christine Caulfield <ccaulfie@redhat.com>
Signed-off-by: NKees Cook <keescook@chromium.org>
Signed-off-by: NDavid Teigland <teigland@redhat.com>