src/northbridge: Add missing 'include <types.h>'

<types.h> is supposed to provide <stdint.h> and <stddef.h>.
When <types.h> is included, <stdint.h> and/or <stddef.h> is removed.

Change-Id: Iad5367bed844b866b2ad87639eee29a16d9a99ed
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32808
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lijian Zhao <lijian.zhao@intel.com>

src/northbridge/intel/sandybridge/raminit.c

@@ -30,6 +30,7 @@
 #include <southbridge/intel/common/smbus.h>
 #include <southbridge/intel/bd82x6x/pch.h>
 #include <cpu/x86/msr.h>
+#include <types.h>
 
 #include "raminit_native.h"
 #include "raminit_common.h"