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/vulkan/libvulkan/Android.bp b/vulkan/libvulkan/Android.bp
index 6149894..5f9b357 100644
--- a/vulkan/libvulkan/Android.bp
+++ b/vulkan/libvulkan/Android.bp
@@ -75,6 +75,7 @@
         "libbase",
         "liblog",
         "libui",
+        "libgraphicsenv",
         "libutils",
         "libcutils",
         "libz",