ath79: gpio-latch-miktorik: use gpiochip_get_data

ath79: gpio-latch-miktorik: use gpiochip_get_data

Oversight from devm conversion. No need for a custom static inline
function.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/16747
Signed-off-by: Robert Marko <robimarko@gmail.com>
(cherry picked from commit 6d2ed484fa2f62e355893f5e1fe3734c88201bfc)
Link: https://github.com/openwrt/openwrt/pull/17097
Signed-off-by: Petr Štetiar <ynezz@true.cz>