rtc: rx6110: Remove unused of_gpio,h

of_gpio.h provides a single function, which is not used in this driver.
Remove unused header.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230215165030.83621-1-andriy.shevchenko@linux.intel.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-rx6110.c

@@ -10,7 +10,6 @@
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
-#include <linux/of_gpio.h>
 #include <linux/regmap.h>
 #include <linux/rtc.h>
 #include <linux/of.h>