Buffet: Move buffet over to platform2 from src/platform/buffet.

This change also open-sources buffet. The only change in this CL
is the removal of the Makefile and addition of the buffet.gyp file.

BUG=chromium:355180
TEST=USE=buffet emerge-gizmo platform2

Change-Id: Ibf8d3ac3f38313f82a9c07d79932b6f30130f9c5
diff --git a/buffet/README b/buffet/README
new file mode 100644
index 0000000..9dc1e87
--- /dev/null
+++ b/buffet/README
@@ -0,0 +1,6 @@
+// Copyright 2014 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.
+
+This directory contains the a Brillo service for registering a device and
+sending/receiving remote commands.