drm/bridge/parade: Drop legacy GPIO header

This driver uses the new GPIO API from <linux/gpio/consumer.h>
so drop the inclusion of the legacy header.
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190708113154.12985-1-linus.walleij@linaro.org

drivers/gpu/drm/bridge/parade-ps8622.c

@@ -8,7 +8,6 @@
 #include <linux/backlight.h>
 #include <linux/delay.h>
 #include <linux/err.h>
-#include <linux/gpio.h>
 #include <linux/gpio/consumer.h>
 #include <linux/i2c.h>
 #include <linux/module.h>