CHERRY-PICK: Add disk_layout.json and legacy_disk_layout.json to Mccloud

BUG=chrome-os-partner:29527
TEST=Run setup_board, build_packages and build_image for board=mccloud

Change-Id: Id5da3a9f067711f1672000e5903fe2b5f1713d37
Original-Change-Id: Icf120d6315a0bb63efabcdbcaba331e456da5f62
Reviewed-on: https://chromium-review.googlesource.com/203356
Tested-by: Shan-fu Chiou <shan-fu.chiou@intel.com>
Reviewed-by: Mohammed Habibulla <moch@chromium.org>
Commit-Queue: Shan-fu Chiou <shan-fu.chiou@intel.com>
(cherry picked from commit 11e3320f53db671e67d30cfb30b9383ee31f0e9d)
Reviewed-on: https://chromium-review.googlesource.com/203601
diff --git a/overlay-mccloud/scripts/disk_layout.json b/overlay-mccloud/scripts/disk_layout.json
new file mode 100644
index 0000000..bab00db
--- /dev/null
+++ b/overlay-mccloud/scripts/disk_layout.json
@@ -0,0 +1,9 @@
+{
+  "_comment": "See http://www.chromium.org/chromium-os/building-chromium-os/disk-layout-format",
+  "metadata":{
+    "rootdev_base": "/sys/devices/pci0000:00/0000:00:1f.2/ata1/host*/target*/*/block/sd*"
+  },
+  "parent": "legacy_disk_layout.json",
+  "layouts":{
+  }
+}
diff --git a/overlay-mccloud/scripts/legacy_disk_layout.json b/overlay-mccloud/scripts/legacy_disk_layout.json
new file mode 120000
index 0000000..c852c22
--- /dev/null
+++ b/overlay-mccloud/scripts/legacy_disk_layout.json
@@ -0,0 +1 @@
+../../../scripts/build_library/legacy_disk_layout.json
\ No newline at end of file