sh: mach-x3proto: Add missing #include <linux/gpio/driver.h>

shx3_defconfig:

    arch/sh/boards/mach-x3proto/setup.c: In function ‘x3proto_devices_setup’:
    arch/sh/boards/mach-x3proto/setup.c:246:62: error: invalid use of undefined type ‘struct gpio_chip’
      246 |                 baseboard_buttons[i].gpio = x3proto_gpio_chip.base + i;
	  |                                                              ^

Fix this by replacing the include of the legacy <linux/gpio.h> by
<linux/gpio/driver.h>.
Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
Link: https://lore.kernel.org/r/CA+G9fYs7suzGsEDK40G0pzxXyR1o2V4Pn-oy1owTsTWRVEVHog@mail.gmail.com
Fixes: 21d9526d ("gpiolib: Make the legacy <linux/gpio.h> consumer-only")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

arch/sh/boards/mach-x3proto/setup.c

@@ -16,7 +16,7 @@
 #include <linux/input.h>
 #include <linux/usb/r8a66597.h>
 #include <linux/usb/m66592.h>
-#include <linux/gpio.h>
+#include <linux/gpio/driver.h>
 #include <linux/gpio_keys.h>
 #include <mach/ilsel.h>
 #include <mach/hardware.h>