NFC: nxp-nci: Fix build warning

When GPIO is not enabled we hit this kind of warning:

   drivers/nfc/nxp-nci/i2c.c: In function 'nxp_nci_i2c_acpi_config':
   drivers/nfc/nxp-nci/i2c.c:320:2: error: implicit declaration of function 'devm_gpiod_get_index' [-Werror=implicit-function-declaration]
     gpiod_en = devm_gpiod_get_index(&client->dev, NULL, 2);

This is fixed by explicitely including gpio/consumer.h.
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/nfc/nxp-nci/i2c.c

@@ -32,6 +32,7 @@
 #include <linux/miscdevice.h>
 #include <linux/module.h>
 #include <linux/nfc.h>
+#include <linux/gpio/consumer.h>
 #include <linux/of_gpio.h>
 #include <linux/of_irq.h>
 #include <linux/platform_data/nxp-nci.h>