mfd: mc13xxx: Stop including of_gpio.h

Neither SPI nor I2C variant uses any APIs from of_gpio.h so let's stop
including it.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20220926054421.1546436-1-dmitry.torokhov@gmail.com

drivers/mfd/mc13xxx-i2c.c

@@ -11,7 +11,6 @@
 #include <linux/mfd/mc13xxx.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
-#include <linux/of_gpio.h>
 #include <linux/i2c.h>
 #include <linux/err.h>
 

drivers/mfd/mc13xxx-spi.c

@@ -15,7 +15,6 @@
 #include <linux/mfd/mc13xxx.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
-#include <linux/of_gpio.h>
 #include <linux/err.h>
 #include <linux/spi/spi.h>