extcon: realtek: Remove unused of_gpio.h

of_gpio.h is deprecated and subject to remove.
The driver doesn't use it, simply remove the unused header.

Link: https://lore.kernel.org/lkml/20240304174913.1198974-1-andriy.shevchenko@linux.intel.com/
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

Author: andy-shev

drivers/extcon/extcon-rtk-type-c.c

@@ -13,7 +13,6 @@
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
-#include <linux/of_gpio.h>
 #include <linux/io.h>
 #include <linux/interrupt.h>
 #include <linux/syscalls.h>