cros-board: add lakitu-arm64 board

Now COS team doesn't use Chrome OS infrastructure. However we
regularly down-merge this upstream repository into our own repository.
Hence we need this change in the upstream.

BUG=b:170716822
TEST=None

Change-Id: Id7cc2012bd3c585c921319775b33d08586eae6da
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/2491622
Tested-by: Edward Jee <edjee@google.com>
Commit-Queue: Edward Jee <edjee@google.com>
Auto-Submit: Edward Jee <edjee@google.com>
Reviewed-by: Roy Yang <royyang@google.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Reviewed-on: https://cos-review.googlesource.com/c/third_party/overlays/chromiumos-overlay/+/8380
diff --git a/eclass/cros-board.eclass b/eclass/cros-board.eclass
index f07cf73..d45cf31 100644
--- a/eclass/cros-board.eclass
+++ b/eclass/cros-board.eclass
@@ -241,6 +241,7 @@
 	kumo
 	kunimitsu
 	lakitu
+	lakitu-arm64
 	lakitu-gpu
 	#lakitu_mobbuild
 	lakitu-nc