src/{drivers,device,ec}: Remove unused <stdlib.h>

Change-Id: I05422ee4b0aa5c02525ef0b4eccb4dc3ecf871e8
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32822
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/ec/google/chromeec/ec_lpc.c

@@ -20,7 +20,6 @@
 #include <device/pnp.h>
 #include <ec/google/common/mec.h>
 #include <stdint.h>
-#include <stdlib.h>
 
 #include "chip.h"
 #include "ec.h"

src/ec/google/chromeec/vstore.c

@@ -15,7 +15,6 @@
 
 #include <stdint.h>
 #include <string.h>
-#include <stdlib.h>
 #include "ec.h"
 #include "ec_commands.h"
 

src/ec/google/wilco/chip.c

@@ -22,7 +22,6 @@
 #include <ec/acpi/ec.h>
 #include <pc80/keyboard.h>
 #include <stdint.h>
-#include <stdlib.h>
 
 #include "commands.h"
 #include "ec.h"