src/mb: Fix non-local header treated as local

Also remove some unnedded includes.

Change-Id: I036208a111d009620d8354fa9c97688eb4e872ad
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/27129
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/src/mainboard/asrock/b75pro3-m/romstage.c b/src/mainboard/asrock/b75pro3-m/romstage.c
index 645fd08..050d6c5 100644
--- a/src/mainboard/asrock/b75pro3-m/romstage.c
+++ b/src/mainboard/asrock/b75pro3-m/romstage.c
@@ -14,7 +14,7 @@
  * GNU General Public License for more details.
  */
 
-#include "northbridge/intel/sandybridge/raminit_native.h"
+#include <northbridge/intel/sandybridge/raminit_native.h>
 #include <superio/nuvoton/nct6776/nct6776.h>
 #include <superio/nuvoton/common/nuvoton.h>