uni_hall: use gpio_get_pin for attach_callback
uni_hall: use gpio_get_pin for attach_callback

Signed-off-by: Michal Tusnio <f37c884579c6b3e4306aaebc2811d4836a4b3c86@gmail.com>

francois-berder/LetMeCreate,francois-berder/LetMeCreate