google/kukui: Update MMU table in romstage and ramstage

In order to get better performance, map dram as cached after dram ready
in romstage.

BUG=b:80501386
BRANCH=none
TEST=Boots correctly on Kukui. Need a futher check after dram
     calibration code ready.

Change-Id: Ie541fe08ee1d5b260abbabc0a5c18fb04e602b9c
Signed-off-by: Tristan Shieh <tristan.shieh@mediatek.com>
Reviewed-on: https://review.coreboot.org/27304
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/kukui/Makefile.inc

@@ -8,4 +8,5 @@ romstage-y += memlayout.ld
 romstage-y += romstage.c
 
 ramstage-y += chromeos.c
+ramstage-y += mainboard.c
 ramstage-y += memlayout.ld

src/mainboard/google/kukui/mainboard.c

@@ -0,0 +1,31 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2018 MediaTek Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <device/device.h>
+#include <soc/mmu_operations.h>
+
+static void mainboard_init(struct device *dev)
+{
+}
+
+static void mainboard_enable(struct device *dev)
+{
+	dev->ops->init = &mainboard_init;
+}
+
+struct chip_operations mainboard_ops = {
+	.name = CONFIG_MAINBOARD_PART_NUMBER,
+	.enable_dev = mainboard_enable,
+};

src/mainboard/google/kukui/romstage.c

@@ -16,6 +16,7 @@
 #include <arch/exception.h>
 #include <console/console.h>
 #include <program_loading.h>
+#include <soc/mmu_operations.h>
 #include <timestamp.h>
 
 void main(void)
@@ -26,5 +27,7 @@ void main(void)
 	console_init();
 	exception_init();
 
+	mtk_mmu_after_dram();
+
 	run_ramstage();
 }