pinctrl: renesas: Remove unneeded #include <linux/gpio.h>

Linus reports that some Renesas pin control sub-drivers are still
including <linux/gpio.h> instead of <linux/gpio/driver.h>.  As these
sub-drivers don't need either, the includes can just be removed.
Reported-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/578825d779b45af745cc7623c7f69d2ddeadac4b.1645605227.git.geert+renesas@glider.be

drivers/pinctrl/renesas/pfc-sh7203.c

@@ -6,7 +6,6 @@
  */
 
 #include <linux/kernel.h>
-#include <linux/gpio.h>
 #include <cpu/sh7203.h>
 
 #include "sh_pfc.h"

drivers/pinctrl/renesas/pfc-sh7264.c

@@ -6,7 +6,6 @@
  */
 
 #include <linux/kernel.h>
-#include <linux/gpio.h>
 #include <cpu/sh7264.h>
 
 #include "sh_pfc.h"

drivers/pinctrl/renesas/pfc-sh7269.c

@@ -7,7 +7,6 @@
  */
 
 #include <linux/kernel.h>
-#include <linux/gpio.h>
 #include <cpu/sh7269.h>
 
 #include "sh_pfc.h"

drivers/pinctrl/renesas/pfc-sh7720.c

@@ -6,7 +6,6 @@
  */
 
 #include <linux/kernel.h>
-#include <linux/gpio.h>
 #include <cpu/sh7720.h>
 
 #include "sh_pfc.h"

drivers/pinctrl/renesas/pfc-sh7722.c

 // SPDX-License-Identifier: GPL-2.0
 #include <linux/init.h>
 #include <linux/kernel.h>
-#include <linux/gpio.h>
 #include <cpu/sh7722.h>
 
 #include "sh_pfc.h"