src/northbridge: Remove unused <delay.h>

Change-Id: I5449feeb65c49c79bc7657a1c3777a0f128a13b1
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60606
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/northbridge/intel/sandybridge/raminit_iosav.c

@@ -1,7 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <commonlib/helpers.h>
-#include <delay.h>
 #include <types.h>
 
 #include "raminit_native.h"