Add overlay logic to Entity Manager

Generate overlays and fixup symbols to map virtual i2c
busses to muxes. Also scan muxes in order as they seem
to get confused if we scan them out of order.

Change-Id: Iec3ed49fca22db8537e4474d9d95cab2da574aef
Signed-off-by: James Feist <james.feist@linux.intel.com>
diff --git a/include/Overlay.hpp b/include/Overlay.hpp
new file mode 100644
index 0000000..54a8964
--- /dev/null
+++ b/include/Overlay.hpp
@@ -0,0 +1,21 @@
+/*
+// Copyright (c) 2018 Intel Corporation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+*/
+
+#pragma once
+#include <nlohmann/json.hpp>
+
+void unloadAllOverlays(void);
+bool loadOverlays(const nlohmann::json &systemConfiguration);
\ No newline at end of file