mb/kontron/bsl6: Use include folder for header files

Change-Id: Id73a7385f7701920efebaa3e293ac50a6ba93272
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47849
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/kontron/bsl6/Makefile.inc

@@ -1,5 +1,7 @@
 ## SPDX-License-Identifier: GPL-2.0-only
 
+CPPFLAGS_common += -I$(src)/mainboard/$(MAINBOARDDIR)/include
+
 bootblock-y += bootblock.c
 
 romstage-y += variants/$(VARIANT_DIR)/romstage.c

src/mainboard/kontron/bsl6/ramstage.c

@@ -1,7 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <soc/ramstage.h>
-#include "gpio.h"
+#include <mainboard/gpio.h>
 
 void mainboard_silicon_init_params(FSP_SIL_UPD *params)
 {

src/mainboard/kontron/bsl6/romstage.c

@@ -8,8 +8,7 @@
 #include <soc/romstage.h>
 #include <fsp/soc_binding.h>
 #include <pc80/mc146818rtc.h>
-
+#include <variant.h>
-#include "variant.h"
 
 /* Rcomp resistor */
 static const u16 rcomp_resistors[3] = { 121, 75, 100 };

src/mainboard/kontron/bsl6/variants/boxer26/romstage.c

@@ -5,8 +5,7 @@
 #include <console/console.h>
 #include <pc80/mc146818rtc.h>
 #include <fsp/soc_binding.h>
-
+#include <variant.h>
-#include "../../variant.h"
 
 void variant_memory_init_params(FSPM_UPD *const mupd)
 {

src/mainboard/kontron/bsl6/variants/bsl6/romstage.c

@@ -1,8 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <fsp/soc_binding.h>
-
+#include <variant.h>
-#include "../../variant.h"
 
 void variant_memory_init_params(FSPM_UPD *const mupd)
 {