drivers: gpio: gecko: Use SIZEOF_FIELD() macro

Use the utility macro instead of bare code.

(cherry picked from commit 9f6451d)

Original-Signed-off-by: Adrien Ricciardi <aricciardi@baylibre.com>
GitOrigin-RevId: 9f6451d
Change-Id: I759ae0b64b2789e390089b76116094b4cdc9dee2
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/5611393
Tested-by: ChromeOS Prod (Robot) <chromeos-ci-prod@chromeos-bot.iam.gserviceaccount.com>
Reviewed-by: Fabio Baltieri <fabiobaltieri@google.com>
Reviewed-by: Jeremy Bettis <jbettis@chromium.org>
Commit-Queue: Fabio Baltieri <fabiobaltieri@google.com>
Tested-by: Fabio Baltieri <fabiobaltieri@google.com>
Tested-by: Jeremy Bettis <jbettis@chromium.org>

drivers/gpio/gpio_gecko.c

@@ -9,6 +9,7 @@
 #include <errno.h>
 #include <zephyr/drivers/gpio.h>
 #include <zephyr/irq.h>
+#include <zephyr/sys/util.h>
 #include <soc.h>
 #include <em_gpio.h>
 #ifdef CONFIG_SOC_GECKO_DEV_INIT
@@ -63,9 +64,8 @@
 #define GECKO_GPIO_MODEH(pin, mode) (mode << ((pin - 8) * 4))
 
 
-#define member_size(type, member) sizeof(((type *)0)->member)
-#define NUMBER_OF_PORTS (member_size(GPIO_TypeDef, P) / \
-			 member_size(GPIO_TypeDef, P[0]))
+#define NUMBER_OF_PORTS (SIZEOF_FIELD(GPIO_TypeDef, P) / \
+			 SIZEOF_FIELD(GPIO_TypeDef, P[0]))
 
 struct gpio_gecko_common_config {
 };