extcon: max3355: Drop unused include

This driver includes the legacy <linux/gpio.h> header but
does not use it. Drop this include.

Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NChanwoo Choi <cw00.choi@samsung.com>

drivers/extcon/extcon-max3355.c

@@ -7,7 +7,6 @@
  */
 
 #include <linux/extcon-provider.h>
-#include <linux/gpio.h>
 #include <linux/gpio/consumer.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>