urara: support building with CHROMEOS enabled

Chrome OS support needs to be enabled on urara. This patch adds a
placeholder file to keep Chrome OS support code.

BRANCH=none
BUG=chrome-os-partner:31438
TEST=none

Change-Id: I8ec328d4f965ff80d17847f2f8ce62b402c42a46
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/226179
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/mainboard/google/urara/Kconfig

@@ -24,6 +24,7 @@ if BOARD_GOOGLE_URARA
 config BOARD_SPECIFIC_OPTIONS
 	def_bool y
 	select BOOTBLOCK_CONSOLE
+	select CHROMEOS
 	select CONFIG_SPI_FLASH_WINBOND
 	select CPU_IMGTEC_PISTACHIO
         select COMMON_CBFS_SPI_WRAPPER

src/mainboard/google/urara/Makefile.inc

@@ -19,6 +19,7 @@
 # MA 02110-1301 USA
 #
 
+ramstage-y += chromeos.c
 ramstage-y += mainboard.c
 
 bootblock-y += memlayout.ld

src/mainboard/google/urara/chromeos.c

@@ -0,0 +1,28 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Google Technologies
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <boot/coreboot_tables.h>
+#include <console/console.h>
+#include <gpio.h>
+
+
+void fill_lb_gpios(struct lb_gpios *gpios)
+{
+	printk(BIOS_ERR, "%s unsupported, but called\n", __func__);
+}