superio: Use 'include <stdlib.h>' when appropriate

Change-Id: I55e7b680e128f29a9fd549edfb676e6571330677
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32830
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/superio/ite/common/env_ctrl.c

@@ -17,9 +17,9 @@
  * GNU General Public License for more details.
  */
 
-#include <stdlib.h>
 #include <console/console.h>
 #include <delay.h>
+#include <stddef.h>
 #include <superio/hwm5_conf.h>
 
 #include "env_ctrl.h"

src/superio/ite/it8528e/superio.c

@@ -19,7 +19,6 @@
 
 #include <device/device.h>
 #include <device/pnp.h>
-#include <stdlib.h>
 #include <superio/conf_mode.h>
 
 #include "it8528e.h"

src/superio/ite/it8623e/superio.c

@@ -19,7 +19,6 @@
 #include <device/device.h>
 #include <device/pnp.h>
 #include <pc80/keyboard.h>
-#include <stdlib.h>
 #include <superio/conf_mode.h>
 #include <superio/ite/common/env_ctrl.h>
 

src/superio/ite/it8712f/superio.c

@@ -18,7 +18,6 @@
 #include <device/device.h>
 #include <device/pnp.h>
 #include <pc80/keyboard.h>
-#include <stdlib.h>
 #include <superio/conf_mode.h>
 
 #include "it8712f.h"

src/superio/ite/it8718f/superio.c

@@ -17,7 +17,6 @@
 #include <device/device.h>
 #include <device/pnp.h>
 #include <pc80/keyboard.h>
-#include <stdlib.h>
 #include <superio/ite/common/env_ctrl.h>
 #include <superio/conf_mode.h>
 

src/superio/ite/it8721f/superio.c

@@ -18,8 +18,8 @@
 #include <device/device.h>
 #include <device/pnp.h>
 #include <pc80/keyboard.h>
-#include <stdlib.h>
 #include <superio/conf_mode.h>
+
 #include "it8721f.h"
 
 static void init(struct device *dev)

src/superio/ite/it8728f/superio.c

@@ -18,7 +18,6 @@
 #include <device/pnp.h>
 #include <superio/conf_mode.h>
 #include <pc80/keyboard.h>
-#include <stdlib.h>
 #include <superio/ite/common/env_ctrl.h>
 
 #include "chip.h"

src/superio/ite/it8772f/superio.c

@@ -20,7 +20,6 @@
 #include <pc80/keyboard.h>
 #include <arch/io.h>
 #include <delay.h>
-#include <stdlib.h>
 #include <superio/conf_mode.h>
 #include <superio/hwm5_conf.h>