nb/intel/sandybridge/raminit_common.h: Add needed <device/dram/ddr3.h>

Change-Id: I059e94ef46fdc959a6e37365eb335409698b987a
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71179
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>

src/northbridge/intel/sandybridge/raminit_common.h

@@ -3,6 +3,7 @@
 #ifndef RAMINIT_COMMON_H
 #define RAMINIT_COMMON_H
 
+#include <device/dram/ddr3.h>
 #include <stdint.h>
 
 #define BASEFREQ	133