drivers: gpio: Wrap driver instances in device API macro

Use the device API macro to place the driver API instance into an iterable
section.

Signed-off-by: Pieter De Gendt <pieter.degendt@basalte.be>

drivers/gpio/gpio_cc23x0.c

@@ -256,7 +256,7 @@ static int gpio_cc23x0_init(const struct device *dev)
 	return 0;
 }
 
-static const struct gpio_driver_api gpio_cc23x0_driver_api = {
+static DEVICE_API(gpio, gpio_cc23x0_driver_api) = {
 	.pin_configure = gpio_cc23x0_config,
 #ifdef CONFIG_GPIO_GET_CONFIG
 	.pin_get_config = gpio_cc23x0_get_config,

drivers/gpio/gpio_mfxstm32l152.c

@@ -612,7 +612,7 @@ static int mfxstm32l152_init(const struct device *dev)
 	return ret;
 }
 
-static const struct gpio_driver_api mfxstm32l152_drv_api = {
+static DEVICE_API(gpio, mfxstm32l152_drv_api) = {
 	.pin_configure = mfxstm32l152_configure,
 	.port_get_raw = mfxstm32l152_port_get_raw,
 	.port_set_masked_raw = NULL,