src/soc/intel: Remove unused <stdlib.h>

Change-Id: I71a5a6c3748d5a3910970bfb1ec3d7ecd3184cfd
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33686
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/broadwell/finalize.c

@@ -20,7 +20,6 @@
 #include <cpu/x86/smm.h>
 #include <reg_script.h>
 #include <spi-generic.h>
-#include <stdlib.h>
 #include <soc/pci_devs.h>
 #include <soc/lpc.h>
 #include <soc/me.h>