This is a slighty modified version of ar71xx gpio-latch driver
written by Gabor Juhos <juhosg@openwrt.org>.
Changes:
* DTS support,
* New gpio API (gpiod_*).
Reviewed-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
Signed-off-by: Denis Kalashnikov <denis281089@gmail.com>