google/urara: Stub out get_write_protect_state()

vboot2 requires it

Change-Id: I63bc3f176af72da8ea172a09aa536a10f1184b14
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: http://review.coreboot.org/11099
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/mainboard/google/urara/Makefile.inc

@@ -20,6 +20,7 @@
 
 bootblock-y += boardid.c
 ramstage-y += boardid.c
+romstage-$(CONFIG_CHROMEOS) += chromeos.c
 ramstage-$(CONFIG_CHROMEOS) += chromeos.c
 ramstage-y += mainboard.c
 

src/mainboard/google/urara/chromeos.c

@@ -18,9 +18,15 @@
  */
 
 #include <boot/coreboot_tables.h>
+#include <bootmode.h>
 #include <console/console.h>
 #include <gpio.h>
 
+int get_write_protect_state(void)
+{
+	printk(BIOS_ERR, "%s unsupported, but called\n", __func__);
+	return 0;
+}
 
 void fill_lb_gpios(struct lb_gpios *gpios)
 {