Load kernel APIs added (once more, from the correct repo)

src/platform/vboot_reference/common/boot_device_stub.c

+/* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Stub implementations of boot device functions.
+ */
+
+#include "boot_device.h"
+
+int BootDeviceReadLBA(uint64_t lba_start, uint64_t lba_count, void *buffer) {
+  return 1;
+}
+
+int BootDeviceWriteLBA(uint64_t lba_start, uint64_t lba_count,
+                       const void *buffer) {
+  return 1;
+}