[RenderEngine] Add Android.bp to RenderEngine

Besides make RenderEngine as static library, this patch also intentionally
moves all header files to public includable directory. The header files will be
structured better in the progress of stripping off GL implementation out of
public interfaces.

BUG: 112585051
Test: Build, flash and do display validation
Change-Id: Ife6e27896a2ccee6a23781a43ebc508e2587eb71
diff --git a/services/surfaceflinger/BufferStateLayer.cpp b/services/surfaceflinger/BufferStateLayer.cpp
index 369ad89..da9dcfb 100644
--- a/services/surfaceflinger/BufferStateLayer.cpp
+++ b/services/surfaceflinger/BufferStateLayer.cpp
@@ -20,9 +20,9 @@
 #define ATRACE_TAG ATRACE_TAG_GRAPHICS
 
 #include "BufferStateLayer.h"
-#include "RenderEngine/Image.h"
 
 #include <private/gui/SyncFeatures.h>
+#include <renderengine/Image.h>
 
 namespace android {