Input: eeti_ts - switch to gpiod API

gpiod API allows standard way of specifying GPIO polarity and takes it into
account when reading or setting GPIO state. It also allows us to switch to
common way of obtaining GPIO descriptor and away form legacy platform data.

Reviewed-by: Daniel Mack <daniel@zonque.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>