src/mainboard: Remove unused include 'sandybridge.h'

Change-Id: I9356a56c34d1c6746cf8acfe931386ffed58ba74
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42353
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

util/autoport/bd82x6x.go

@@ -297,7 +297,6 @@ func (b bd82x6x) Scan(ctx Context, addr PCIDevData) {
 	sb.WriteString(`
 
 #include <bootblock_common.h>
-#include <northbridge/intel/sandybridge/sandybridge.h>
 #include <northbridge/intel/sandybridge/raminit_native.h>
 #include <southbridge/intel/bd82x6x/pch.h>