src: Add missing include <stdlib.h>

Change-Id: I17dc2fed6c6518daf5af286788c98c049088911e
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37366
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
diff --git a/src/soc/intel/broadwell/me.c b/src/soc/intel/broadwell/me.c
index 0021d2c..448c5da 100644
--- a/src/soc/intel/broadwell/me.c
+++ b/src/soc/intel/broadwell/me.c
@@ -29,6 +29,7 @@
 #include <device/pci.h>
 #include <device/pci_ids.h>
 #include <device/pci_def.h>
+#include <stdlib.h>
 #include <string.h>
 #include <delay.h>
 #include <elog.h>