src: Use include <delay.h> when appropriate

Change-Id: I23bc0191ca8fcd88364e5c08be7c90195019e399
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32012
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-by: David Guckian

src/northbridge/intel/sandybridge/raminit.c

@@ -30,7 +30,7 @@
 #include <southbridge/intel/bd82x6x/me.h>
 #include <southbridge/intel/common/smbus.h>
 #include <cpu/x86/msr.h>
-#include <delay.h>
+
 #include "raminit_native.h"
 #include "raminit_common.h"
 #include "sandybridge.h"