gpio: sim: drop kernel.h include

We included kernel.h for ARRAY_SIZE() which has since been moved into
its own header. Use it instead.

Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20240610140548.35358-3-brgl@bgdev.pl
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Author: Bartosz Golaszewski

drivers/gpio/gpio-sim.c

@@ -7,6 +7,7 @@
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
+#include <linux/array_size.h>
 #include <linux/bitmap.h>
 #include <linux/cleanup.h>
 #include <linux/completion.h>
@@ -20,7 +21,6 @@
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/irq_sim.h>
-#include <linux/kernel.h>
 #include <linux/list.h>
 #include <linux/lockdep.h>
 #include <linux/minmax.h>