Input: zaurus keyboard driver updates

  * Change the scan interval from 100ms to 50ms. This stops the key
    repeat from triggering on double letter presses.
  * Remove unneeded stale hinge code from corgikbd
  * Change unneeded corgi GPIO pins to inputs when suspended
  * Add support for the headphone jack switch for both corgi and spitz
    (as switch SW_2)

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>