input: drop unnecessary dependencies on TTY

Backing out changes made in earlier TTY removal patch.  Switched
to only one dependency in SERPORT on TTY instead of many incorrect
dependencies.

Signed-off-by: Joe Millenbach <jmillenbach@gmail.com>
Reported-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>