src: Remove unused 'include <bootmode.h>'

Change-Id: I658023f7c3535a2cddd8e11ca8bebe20ae53ffb0
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41670
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/northbridge/intel/sandybridge/raminit.c

@@ -2,7 +2,6 @@
 
 #include <console/console.h>
 #include <commonlib/region.h>
-#include <bootmode.h>
 #include <cf9_reset.h>
 #include <string.h>
 #include <arch/cpu.h>