nb/intel: Deduplicate vbt header

Move header and delete duplicates.

Change-Id: I0e1f5d9082626062f95afe718f6ec62a68f0d828
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/18903
Tested-by: build bot (Jenkins)
Tested-by: coreboot org <coreboot.org@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/northbridge/intel/haswell/haswell.h

@@ -214,7 +214,7 @@ void report_platform_info(void);
 #endif /* !__SMM__ */
 
 #if !defined(__PRE_RAM__)
-#include "gma.h"
+#include <drivers/intel/gma/opregion.h>
 int init_igd_opregion(igd_opregion_t *igd_opregion);
 #endif