GraphicsEnv is separated from libui

GraphicsEnv class is separated from libui in order to make libui VNDK.
The class is then built as a standalone library named
'libgraphicsenv.so'. Clients that were using the GraphicsEnv class are
also updated to reference the new library.

Bug: 38097618
Test: sailfish builds and boots

Change-Id: I4c35fdff0e92453b98ea21136ef0f99fab01b6f8
diff --git a/opengl/libs/Android.bp b/opengl/libs/Android.bp
index a895e63..bff80cd 100644
--- a/opengl/libs/Android.bp
+++ b/opengl/libs/Android.bp
@@ -81,7 +81,7 @@
     shared_libs: [
         // ***** DO NOT ADD NEW DEPENDENCIES HERE *****
         // In particular, DO NOT add libutils nor anything "above" libui
-        "libui",
+        "libgraphicsenv",
         "libnativewindow",
         "libbacktrace",
     ],