tty: Mark unconverted drivers as BROKEN

Nobody seems to use these drivers anyway so if they want them they can
fix them up. I don't have the needed info to add break_ctl support to them.
Send patches if you don't like it.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>