Cleanup coreboot memory table includes

The includes removed here were previously required for
struct lb_memory and lb_add_memory_range().

Change-Id: Ie6c0d4ef55c2225aa709cf3fbad30ff1080e3610
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/1391
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Tested-by: build bot (Jenkins)

src/northbridge/intel/i945/northbridge.c

@@ -28,7 +28,6 @@
 #include <string.h>
 #include <bitops.h>
 #include <cpu/cpu.h>
-#include <boot/tables.h>
 #include <arch/acpi.h>
 #include "chip.h"
 #include "i945.h"