Input: ucb1400_ts - fix suspend and resume handling

Instead of stopping the touchscreen we were starting it in suspend, and
disabling it in resume.

Fixes: c899afed

 ("Input: ucb1400_ts - convert to threaded IRQ")
Reported-by: Anton Volkov <avolkov@ispras.ru>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>