iio: ad2s1200: Drop legacy include

This driver is using the GPIO descriptor API but yet includes
the legacy <linux/gpio.h> header for no reason. Drop the
surplus include.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
1 file changed