gpio: idio-16: Actually make use of the GPIO_IDIO_16 symbol namespace

DEFAULT_SYMBOL_NAMESPACE must already be defined when <linux/export.h>
is included. So move the define above the include block.

Fixes: b9b1fc1ae119 ("gpio: idio-16: Introduce the ACCES IDIO-16 GPIO library module")
Signed-off-by: Uwe Kleine-König <[e-mail]>
Acked-by: William Breathitt Gray <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Bartosz Golaszewski <[e-mail]>

drivers/gpio/gpio-idio-16.c

···
  * GPIO library for the ACCES IDIO-16 family
  * Copyright (C) 2022 William Breathitt Gray
  */
+
+#define DEFAULT_SYMBOL_NAMESPACE "GPIO_IDIO_16"
+
 #include <linux/bits.h>
 #include <linux/device.h>
 #include <linux/err.h>
···
 #include <linux/types.h>
 
 #include "gpio-idio-16.h"
-
-#define DEFAULT_SYMBOL_NAMESPACE "GPIO_IDIO_16"
 
 #define IDIO_16_DAT_BASE 0x0
 #define IDIO_16_OUT_BASE IDIO_16_DAT_BASE