drivers: gpio_mmio32: Add gpio_driver_data to driver data

Add gpio_driver_data as the first element in the driver data as the gpio
core expects this.

Signed-off-by: Kumar Gala <[email protected]>

Author: galak

include/drivers/gpio/gpio_mmio32.h

@@ -17,6 +17,8 @@ struct gpio_mmio32_config {
 };
 
 struct gpio_mmio32_context {
+	/* gpio_driver_data needs to be first */
+	struct gpio_driver_data common;
 	const struct gpio_mmio32_config *config;
 	u32_t invert; /* Mask of 'reg' bits that should be inverted */
 };