move GraphicEnv from libgui to libui

This breaks a circular dependency between libEGL
and libgui.

Test: compiled and booted a device
Change-Id: I78932bba07fb9ef310d8e1622bd3a47f57e89c45
diff --git a/vulkan/libvulkan/Android.bp b/vulkan/libvulkan/Android.bp
index 746ab4e..524de75 100644
--- a/vulkan/libvulkan/Android.bp
+++ b/vulkan/libvulkan/Android.bp
@@ -69,12 +69,12 @@
         "vulkan_headers",
     ],
     shared_libs: [
-        "libgui",
         "libziparchive",
         "libhardware",
         "libsync",
         "libbase",
         "liblog",
+        "libui",
         "libutils",
         "libcutils",
         "libz",