Input: adp5588-keys - use the right header

This keyboard driver is implementing a GPIO driver, so it need
to include <linux/gpio/driver.h> and not the legacy <linux/gpio.h>
header.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20210820222958.57238-1-linus.walleij@linaro.org


Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>