src/arch: Remove unused <stdlib.h>

Change-Id: I79f065703b5249ca9630b06de7142bc52675076e
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32820
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/arch/arm64/fit_payload.c

@@ -14,7 +14,6 @@
 
 #include <console/console.h>
 #include <bootmem.h>
-#include <stdlib.h>
 #include <program_loading.h>
 #include <string.h>
 #include <commonlib/compression.h>